USB 2.0 vs. USB 3.0

USB 2.0		USB 3.0
Released	April 2000	November 2008
Speed	High Speed or HS, 480 Mbps	10 times faster than USB 2.0. Super Speed, 4.8 Gbps.
Signaling Method	can either send or receive data.	can send and receive data simultaneously
Price	the USB 2.0 version is generally less expensive than it's USB 3.0 version.	the USB 3.0 version is generally more expensive than it's USB 2.0 version.
Power Usage	Up to 500 mA	Up to 900 mA. .
Number of wires within the cable	4	9
Standard-A Connectors	Grey	Blue
Standard-B Connectors	Smaller in size	Extra space for more wires
Max Cable length	5 meters	3 meters

NFC

It is a wireless connectivity technology that allows convenient short-range communication between electronic devices. NFC connects all type of communication devices and allow easy communication between them.

Advantages

it is a secure gateway to the connected world, now NFC-enabled mobile devices will allow consumers to store and access all kinds of their personal data at home. they can easily do this by bringing two NFC devices close, they at once initiate network communication without the help of user to make them do so. NFC-enhance devices can easily exchange and store your personal data like messages, pictures, MP3 files, etc. providing ease of use, instant intuitive connectivity, zero configuration and smart key access, NFC fulfils all the needs of connected consumers and provides better networks services for phones.

Cell phone vs Landline

BENEFITS OF A CELL PHONE

Here you will learn if either cell phones are better or landline is better so by reading the points below you will get to know which is better.

Mobility:  this is very obvious and you experience it in your daily life that a mobile phone can be carried anywhere  you want whereas a landline cant be taken anywhere the reason being that it always needs a base unit to connect it and make a call. and a mobile phone can be carried anywhere and you can make calls from anywhere you are no matter what.

Functionality:  this is very obvious that the functionality of a mobile phone is much more than a landline. by using a phone you can text, send voice mail, take pictures, make calls, use internet, GPRS, different kind of apps and many more but a landline can only make calls.

Cost: A mobile phone may be more cost efficient because if offers its users different kind of packages whereas a landline does not provide any such kind of packages.

BENEFITS OF A LANDLINE

 

Reception: Even though a mobile phone has become very efficient and convenient in use but still a phone does not provides a clear reception and smooth phone calls as a landline.

Family: some people don't want to buy their kids a cell phone because of some kind of personal reasons but they at the same time want to stay connected with them so a landline is a very good way of doing so.

Emergencies: in an emergency case you can easily dial 911 and the authorities will get to know your location at the very instant but if youre calling them using a cell phone it will be difficult and time taking for them to locate you.

 

WiFi VsWimax

Wi-Fi products are used to build WLANs, while WiMAX products are used to build WMANs.

A Wireless Local Area Network (WLAN) is a group of devices linked together by wireless within a relatively small space like a single office building or home. Three WLAN technologies were included in the original 802.11 standard: Infrared, Frequency Hopping Spread Spectrum (FHSS), and Direct Sequence Spread Spectrum (DSSS). 802.11b focused exclusively on DSSS; 802.11a/g/n also used Orthogonal Frequency Division Multiplexing (OFDM).

Wi-Fi is a certification applied to 802.11a/b/g/n products tested by the Wi-Fi Alliance, an industry consortium that promotes interoperability in heterogeneous WLANs. For example, all 802.11g products implement standard OFDM and DSSS, but only Wi-Fi certified products have proven that they correctly support a mandatory subset of features and options.

To create a WLAN, enterprises, small businesses, and home owners can purchase Wi-Fi certified Access Points (APs) and clients (laptops, phones, printers). Clients must be no more than a few hundred feet from the closest AP. Larger buildings can be covered by installing multiple APs that are connected to each other. Most WLANs are deployed indoors, but WLANs can also cover parking lots or courtyards or other local outdoor areas.

Wireless Metropolitan Area Networks (WMANs) use wireless "last mile" technologies to connect subscriber stations (customer premise equipment) to base stations (carrier network infrastructure), providing a wireless alternative to wireline Internet access technologies like DSL, cable, or fiber.

802.16 standards define several WMAN technologies that operate at various frequencies, distances, and speeds to deliver Broadband Wireless Access (BWA). The original 802.16 focused on Fixed BWA, using point to point wireless uplinks to connect subscriber networks to carrier networks and the Internet. More recently, the 802.16e amendment defined Mobile BWA to serve subscriber stations that are not fixed in place, like laptops used in cars and trains.

WiMax is a certification applied to 802.16 products tested by the WiMAX Forum. Carriers build and operate WMANs by purchasing licensed spectrum and then deploying WiMAX base stations throughout a city, region, or other designated coverage area. To use the WMAN, subscribers must purchase wireless services from a carrier. For example, Sprint recently launched a commercial WiMAX service called XOHM in Baltimore. Consumers in and around Baltimore that want to use XOHM must purchase a compatible WiMAX device and pay Sprint for air time.

Here are some key differences between WLANs and WMANs, supported by Wi-Fi and WiMAX products:

1        It's possible to use WMAN technology indoors, but 802.16 protocols are optimized for outdoor operation. It's possible to use WLAN technology outside, but 802.11 protocols were primarily designed for indoor networks.

•         Larger WLANs can be constructed using many densely-spaced Wi-Fi APs, but to blanket miles of territory with wireless, you really want to create a WMAN technology. On the other hand, using WiMAX products for communication between PCs inside the same building would be pricey and impractical -- that's precisely what WLAN technologies were created for.

•         Most office and home WLANs are composed of Wi-Fi products operating in unlicensed spectrum -- channels freely available for use by anyone. WiMAX products most often operate in spectrum licensed to wireless carriers who use them to deliver commercial BWA services.

For nuts-and-bolts differences, check out Michael Finneran's excellent paper on WiMax versus Wi-Fi.

The bottom line is that WLANs and WMANs are complementary network architectures, supported by standard technologies that were designed for very different environments and purposes. This is why your next laptop may well include both Wi-Fi and Mobile WiMAX adapters. Use the Wi-Fi adapter to connect to your office or home WLAN free-of-charge, but use the WiMAX adapter when you're on the go to reach the Internet through a carrier's WMAN.

 

Bluetooth Vsinfrared

Infrared technology is used in remotes. the more the strength of the remote the more the infrared rays can travel, but for household electronics the range is less then 50 feets. in order to have a signal detected there should be a straight line between the transmitter and the receiver. If there is a wall or large object between the transmitter and receiver than  the signal will not pass through it.

Bluetooth  uses a radio frequency, which allows transmission of infrared signal through walls and other big objects. The range  Bluetooth device is about 30 ft. Because Bluetooth technology is based on a standard 2.4 GHz frequency, different Bluetooth devices can easily communicate with each other, regardless of the manufacturer. this means that it can be of any company not necessary Samsung or acer or any other manufacturer. 
While Bluetooth is well on its way to replacing infrared in many different areas, the technology is not meant to be used for wireless networking. Instead, wifi technology, which has a larger range and higher bandwidth than Bluetooth, is the standard that most wireless networking equipment uses to compare.

Side Effects of facebook

facebook is a social networking site. it has reduced the distance between people to a great extent but at the same time it has many adverse effects too. some parents allow their children to use facebook and they get involved in wrong activities without their parents knowledge and hence create troubles for themselves and others too. people keep on posting silly statuses and when some one else see them they develop envious and jealous feelings which results in the destruction of the peace of their mind and the society. many fake accounts are made and people are targeted. so the use of facebook should be avoided as it leads to many problems if not used in a right way. 

Difference between 3G and 4G

	3G	4G
Data Throughput	Up to 3.1Mbps	2 to 12 Mbps .
Peak Upload Rate	5 Mbps	500 Mbps
Peak Download Rate	100 Mbps	1 Gbps
Switching Technique	packet switching	packet switching, message switching
Network Architecture	Wide Area Cell Based	LAN and Wide area.
Services And Applications	CDMA 2000, UMTS, EDGE etc	Wimax2 and LTE-Advance
Forward error correction (FEC)	3G uses Turbo codes for error correction.	Concatenated codes are used for error corrections in 4G.
Frequency Band	1.8 – 2.5 GHz	2 – 8 GHz

How to block a site

How do u block a website on your PC ??

I use Facebook on my office PC, but i have a habit to remain Logged in, even why i shutdown my PC.So in my absence if anyone has turned ON my pc & accessed Facebook, then that would be a problem for me.

So what i can do is, I can block certain websites, so that nobody can access it. Here is an easy way of doing so. blocking a site.

 

Go to

C:\Windows\System32\drivers\etc

you will see a file named HOSTS.

Open it with NOTEPAD.

Then search for the line 127.0.0.1 localhost

To block the website facebook.com for example, add this text under 127.0.0.1 localhost:

127.0.0.1 www.facebook.com

You can add as many sites as you want, but do not forget to prefix it with "127.0.0.1".

6. Save the file

Now Facebook will get blocked in all web browsers

Tips to enhance the system speed

1.Let your PC boot up completely before opening any applications.

2.Refresh the desktop after closing any application. This will remove any unused files from the RAM.

3.Do not set very large file size images as your wallpaper. Do not keep a wallpaper at all if your PC is low on RAM (less than 64 MB).

 

4.Do not clutter your Desktop with a lot of shortcuts. Each shortcut on the desktop uses up to 500 bytes of RAM

5.Empty the recycle bin regularly. The files are not really deleted from your hard drive until you empty the recycle bin.

6.Delete the temporary internet files regularly.

7.Defragment your hard drive once every two months. This will free up a lot of space on your hard drive and rearrange the files so that your applications run faster.

8.Always make two partitions in your hard drive. Install all large Softwares (like PSP, Photoshop, 3DS Max etc) in the second partition. Windows uses all the available empty space in C drive as virtual memory when your Computer RAM is full. Keep the C Drive as empty as possible.

 

9.When installing new Softwares disable the option of having a tray icon. The tray icons use up available RAM, and also slow down the booting of your PC. Also disable the option of starting the application automatically when the PC boots. You can disable these options later on also from the Tools or preferences menu in your application.

10. Protect your PC from dust. Dust causes the CPU cooling fan to jam and slow down thereby gradually heating your CPU and affecting the processing speed. Use compressed air to blow out any dust from the CPU. Never use vacuum.

RAM IS THE WORKING AREA (DESKTOP) OF THE CPU, KEEP IT AS EMPTY AND UNCLUTTERED AS POSSIBLE!

Port in computing

 

1. An Internet port is a number that tells what kind of protocol a server on the Internet is using. For example, Web servers typically are listed on port 80. Web browsers use  port when accessing web pages by default, but you can also specify what port you would like to use in the URL like this: http://www.excite.com:80.

 2. A hardware port are the ports which are at the back side of the CPU where a keyboard, a mouse , speakers can be plugged.

 

3. The verb port is used for editing of a software program's code so that it can run on another platform.

How to turn off auto correction in ipad

Sometimes it becomes very irritating when you have to cancel wrong words predicted again and again. iPad allows you to disable Predictive text if it is annoying you.

1  Go to Settings > General > Keyboard.

2  Select ‘Auto Correction’ and turn it OFF.

Turning Auto Selection off will automatically disable ‘Check Spelling’ feature

Sont A5100 Camera

     this sony camera has APS-C sensor, the Sony A5100 is an intriguing proposition. it has the feature of dual video recording, which is the ability to record two different videos at a time. it is small in size and the picture quality is totally adorable. if image quality and portability are your major concerns then this camera is best.
      It Is very small comfortable in holding and is portable. New dual video record function, Quick autofocus and good dynamic range. besides its pros there are a few of its cons too and they are that it Lacks an EVF and external mode dial, No hot shoe, JPEG processing at higher ISOs not as good as some competing mid-level models.

sony A77 ||

The Sony A77 II's image quality is very good, especially at lower ISOs and at higher ISOs from RAW, burst shooting performance is top-notch, and single-shot AF is fast.Though it misses the mark in one main area, its a very nice, well-rounded camera in most other areas. it is 24.3 megapixel camera. It has the following features:
  

 offset micro lenses

12fps continuous shooting with autofocus

79 point AF module with 15 cross-type AF points, covering 40% of frame

Increased control over AF behavior

Audio level monitoring during movie shooting

2.4M dot OLED viewfinder

Pull-out three-hinge tilt/swivel 1.23m dot White Magic LCD screen

Built-in Wi-Fi with NFC

1/8000th maximum shutter speed

ISO 100 - 25,600

Auto ISO customization

Optional, profile-based correction of chromatic aberrations and geometric distortion

Top panel LCD

Stereo microphone and external mic socket

AF Micro Adjust

 

Avo aquarium

Avo, is a self cleaning fish tank. it cleans the water inside it automatically. Avo’s natural filter takes harmful ammonia from fish waste and turns it into nitrate, which fertilizes the environment’s plants and keeps the water clean. The fish tank also has an  moving bed filter, which makes it difficult for typical aquarium gunk to build up. the water never needs to be changed. Avo beautifies the aquarium it has 7 different  plant pots surrounding its centrally located filter. which means that they're on its sides covering the circular wall of the aquarium. The pots can be easily removed for plant trimming or to change existing plants. it can hold up to 15 liters of water.
       Avo’s plant specific LED lighting which is right above the aquarim is designed to prevent algae growth while ensuring your plants continue to thrive and cleanse the water. The light will appear in three soft colors which represents the three peroids of a day like daytime, night, morning. while providing key conditions for photosynthesis and plant growth. its temperature is fixed it will stay at 27 degrees at all times.

Intel 2 in 1

intel introduces two in one  which means that a laptop along with a tablet in one device. It is a powerful 2 in 1 laptop and tablet fun. It has immersive graphics.  It instantly becomes active with just a single touch of button. It include PC ability with tablet longevity now you can enjoy up to 10 hours on a single charge in a thin and light 2 in 1 form factor for work and play on the go. It has up to 10 hours battery life. it has an amazing intel processor.
Thin, light, with the full performance of a laptop, plus the fun of a tablet and long-lasting power.

Ipad Pro

 ipad pro has a  12.9-inch Retina display and refined Multi‑Touch technology. It’s not just larger. ipad pro helps you be more productive.
it has the highest retina resolution than any other apple device. its retina resolution is 5.6 million pixels. it has a 12.9‑inch screen that makes  everything you do even if it is  editing video, designing presentations, running a business  and any other work. iPad Pro has a variety of built‑in apps. And on the App Store, you’ll find incredible apps designed just for iPad so you can use the existing apps as well as download more apps.
iPad Pro has thumbprint lock system instead of forgettable passwords. So you can unlock your device with just a touch and keep your personal data safe always even your friend is using it. It has two high quality cameras that captures your lovely moments. It has fast wireless quality. So enjoy it with new Ipad pro.

home tempreature monitoring

home temperature monitoring is a temperature sensors are devices which sense the temperature of inside of a house. most people use temperature sensors for security purposes. as the temperature increases the range of the temperature sensor it starts to beep and the people get to know that something is wrong. they are a kind of warning alarm. when a temperature moni
toring device beeps beeps its up to the person to call the fire fighters accordingly to the situation. they play an important role in the security of the house.

Digital Photo Frame

     A Digital photo frame is a picture frame that displays digital photos without the need of a computer or printer. digital photo frames are generally designed for the display of photographs.
     Digital photo frames come in a variety of different shapes and sizes with a range of features. Some may even play videos as well as display photographs some may play a song whilst the pictures are moving. This is a frequently asked question that how it displays different pictures are they loaded in it? No, the answer to this question is very simple we connect a USB loaded with pictures in it. And the digital photo frame keeps on displaying the pictures

Vein Identification

Another technology invention is the biometric identification and security device known as Palm Secure. It works by identifying the vein pattern of the palms of anyone's hand who places his hand on the device. Similar to our fingerprints, vein patterns are unique to each individual as everyone has different fingerprints  the same way every individual has different veins pattern. The advantages of this technology is that it is less expensive, easier to manage, and is more reliable than other methods of identification.

Samsung SUHD TV

Samsung SUHD TV is a TV introduced by Samsung. it delivers superior picture quality with amazing  contrast, striking brightness and spectacular color. Samsung SUHD TV has many additional features than its previous models its SUHD re-mastering engine delivers an amazing viewing experience. its stylish curved design provides viewers with a more better viewing experience and it is powered by Tizen, its screen is curved and hence is more attractive for its viewers. Its picture quality is unmatched. it gives the viewers a superior quality experience.
The SUHD engine automatically interprets the brightness of images on the screen to minimize additional power consumption.  it  expresses ultimate contrast levels, producing images with 2.5mm ore brightness and twice the color adjustment points for more good picture quality.

Youtube

Youtube is a video sharing website. Most of the content on YouTube has been uploaded by individuals, but media corporations including CBS, the BBC, Vevo, Hulu, and other organizations offer some of their material via YouTube, as part of the YouTube partnership program which meansthat they have done partnership with youtube.Unregistered users can only watch videos whereas registered users can upload videos to their channels. they can select the catogery in which their videos lie and hence uload them with ease.  The viewers who may be registered can like and comment on these videos. Videos considered to contain potentially offensive content are available only to registered users affirming themselves to be at least 18 years old. you can add the videos to your favourite list and can view them anytime you want. very informative videos are shared on youtue. many lectures on different subjects are available on the site and much more informative videos are available. you can also download a youtube app in your smartphones and can directly serch the videos and watch them. it provides the video quality menu too you can increase the clearity of the videos. youtube allows us to share videos on different social media sites like facebook etc.

Cacoon security syatem

 you always have to set alarms for the security purpose but cacoon helps you by learning the situations that are normal for you. this intelligent security device is self alarming. it uses your cell phones location to knoe if youre at home or not. it acts as a guard. it learns all your activities that is your schedule. it is a single device device. it has no replacable battries and is rechargeable. you can record live footage of anything using cacoon and then can watch them later too. it avoids false alarms and it gives a beep on your smartphone that is a notification if there is something wrong.it senses all the activities taking place in the home. so buy cacoon and live a secure life.

Barisieur coffee maker and alarm clock

If not ourselves, we all know that people love drinking coffee and cant can’t start their morning without having a mouthful of it. The Barisiuer is an elegantly designed alarm clock that starts your day with a freshly-brewed cup of coffee before you even get out of bed. It eases the user into the day with the subtle movement of stainless steel ball bearings that boil the water through induction heating, accompanied by the smell of freshly brewed coffee. It eases the tasks of everyday life by making the coffee for you otherwise you have to get out of your bed and make a coffee for yourself. The Barisiuer features a drawer compartment to store ground coffee beans and sugar and a tube for a shot or two of milk. So it has made the users life really easy and healthful.

Apple Pencil

no worries if you haven't seen an apple pencil still you know how to use it this might be very interesting but its true you use it the right way the first time you hold it. This is because it is very simple to use you just have to use it like an ordinary pencil. even if youre on a road trip or anywhere in the world if you have an apple ipad and pencil it allows you to use it in drawing, sketching or many other things. iPad Pro senses whether you’re using your finger or Apple Pencil. When iPad Pro senses Apple Pencil, the system scans the signal it sends at an amazing  240 times per second. so t collects double the data as it can catch when you use your finger.  It simply draws lines when you apply pressure The carefully positioned sensor inside the device determines precisely how hard the tip of Apple Pencil is being pressed down. Press harder to draw thicker lines. You can do shading just with the tilt of your hand. It has12 hours battery life this means that 15 seconds equals to 30 minutes of battery life

Xbox one

Along with the Xbox One 1TB announcement, Microsoft  Xbox Wireless Adaptor for Windows has many new interesting updates and features. Xbox one will have a plenty of space for games, videos and media so you can install many games in it besides  You can also add your own USB  but the other hardware remains the same. Apart from the new design, the controller features a 3.5mm stereo headphone jack so you can plug your handset straight in it. The Microsoft has improved the quality of the controller and has increased the maximum audio volume. This is a whole new upgraded xbox that will offer you many new exciting features

Samsung Galaxy Tab2

The Galaxy Tab S2 rocks up in two sizes, a larger 9.7-inch slate boasts the same screen size as the iPad Air 2, while the smaller 8-inch Tab S2 is just a touch bigger than the 7.9-inch iPad Mini 3. The larger 9.7-inch Tab S2 rocks up with dimensions of 237.3 x 169 x 5.6mm, making it thinner then the already wafer thin iPad Air 2 and Sony Xperia Z4 Tablet which come in at 6.1mm. That impossibly slender frame is carried over to the smaller 8-inch Galaxy Tab S2 as well, with its other dimensions coming in at 198.6 x 134.8mm makes it look so sleek and slender. It consists of  8MP camera too. So you can create your own photo gallery.
 It has a fingerprint scanner built in, allowing you to unlock the slate with the touch of a digit..
The 9.7-inch model comes with a 5870mAh battery, while the 8-inch tablet makes do with a 4000mAh offering. So rush to the nearest electronic store and buy the new Samsung galaxy tab s2 and enter the world of technology.

 

 

 

LG 3D Glasses

3D technology has made its way in the new world and has made the world see the movies in 3D through these 3D glasses. Today 3D has taken over the movie theaters and is now making its way to your living room. LG has created a 3D home entertainment system that will take your home viewing experience to a whole new level. The system includes the LG AG-S100 3D glasses. These rechargeable and lightweight 3D glasses are sleek and stylish. 3D glasses have the look and feel of a regular pair of sunglasses, but they are actually outfitted with active shutter technology that makes the crystal lens darken and lighten in sync with images being projected by the TV.
To save on additional costs, the LG AG-S100 is equipped with a rechargeable battery. When battery needs to be recharged, the LED indicator light will blink six times then pause and blink six times again. This blinking pattern will repeat for one minute, then the glasses will automatically shut down. While they're charging, you should not wear the glasses. LG does not recommend a plug-and-play attitude; they instead suggest allowing the 3D glasses to charge for a full two hours before using them again. The 3D glasses are not adjustable though they’re fixed and can fit a person perfectly. Besides one can’t deny the fun that you have when these glasses are worn they’re totally spectacular. So now you can enjoy and watch everything on your television in 3D.

Sony PSP E1004

carry a complete entertainment solution with you and keep on having fun even when you are not home. Take it on long trips. Now you can take the sony portable psp along with you and enjoy yourself throughout the trip. Sony portable psp is capable of storing many and many video games  at a time and allows the user to play them anywhere anytime. The color reproduction, fast screen refresh rate and an enhanced multimedia features make for a brilliant visual experience. With dimensions of 172.4 x 21.6 x 73.4 mm, this psp console fits comfortably in the palm of your hands. Weighing a mere 223 g, the beautifully  designed gaming gadget is light-weight and can be carried in your pocket or backpack.
 
You can enjoy game on the psp consisting of 4.3 inch TFT LCD screen. The vibrant color resolution of psp lets you view clear and smooth view. The screen is a full-transparent type display. Sleek and sophisticated. The right side of the PSP holds the all-important action buttons with which you can press according to the function that the game requires. The left side of psp has a D-pad.  By pressing them you can control the movements of your character in the game. There are two buttons on the top either sides they have their own purpose it all depends on the game you’re playing. There are various ports there on the psp. It is rechargeble. The Sony PSP E1004 handheld console connects to the Internet wirelessly, a feature that doubles the functionality of this gadget. So enjoy your new sony psp E1004 and have fun.

Wii

           Wii is a game infact a video game console. It is invented by Nintendo. The Wii introduced the Wii Remote controller can be used as a handheld pointing device and which detects movement in three dimensions which means that it can detect movement of its remote and hence the user plays the game. Another notable feature of the console is the now  WiiConnect24 which enabled it to receive messages and updates over the Internet while in standby mode Like other seventh-generation consoles. Wii remote works without connecting to a socket, it is portable and wireless.

Light pen

A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT display.
It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy. A light pen can work with any CRT-based display and other display technologies, but its ability to be used with LCDs was unclear.

A light pen detects a change of brightness of nearby screen pixels when scanned by cathode ray tube electron beam and communicates the timing of this event to the computer. Since a CRT scans the entire screen one pixel at a time, the computer can keep track of the expected time of scanning various locations on screen by the beam and infer the pen's position from the latest timestamp.

Android lollipop

Android Lollipop is a version of the Android mobile operating system developed by Google, Its version is 5.0 to 5.1.1. It was released in 2014 during the Google conference.
One of the most prominent changes in the Lollipop release is a redesigned user interface built around a design language. Other changes include improvements in the notifications, which can be accessed from the lockscreen and displayed within applications as top-of-the-screen banners. Google also made internal changes to the platform, with the Android Runtime improved application performance, and with changes intended to improve and optimize battery usage.
        Android lollipop introduces a refreshed notification system. Individual notifications are now displayed on cards to adhere to the material design language, and batches of notifications can be grouped by the app that produced them. Notifications are now displayed on the lock screen as cards, and "heads up" notifications can also be displayed as large banners across the top of the screen, along with their respective action buttons. A do-not-disturb feature is also added for notifications. The recent apps menu was redesigned to use a three-dimensional stack of cards to represent open apps. Individual apps can also display multiple cards in the recent menu, such as for a web browser's open tabs.

Bluetooth

Bluetooth is a wireless technology standard for exchanging data over short distances. Bluetooth only works in the devices have this facility. All what the user has to do is turn on his Bluetooth in his smartphone or laptop or any other device which supports Bluetooth and ask the other person to whom he has to send the selected files to turn his Bluetooth on too. in this way the files can easily be transferred without difficulty. Bluetooth operates at frequencies between 2402 and 2480 MHz, or 2400 and 2483.5 MHz
       Bluetooth exists in many products, such as telephones, tablets, media players, robotics systems, handheld, laptops and console gaming equipment, and some high definition headsets, modems and watches.
      
The Bluetooth Core Specification Working Group (CSWG) produces mainly 4 kinds of specifications

• The Bluetooth Core Specification, release cycle is typically a few years in between
• Core Specification Addendum (CSA), release cycle can be as tight as a few times per year
• Core Specification Supplements (CSS), can be released very quickly
• Errata
  

Amazon Echo

      Amazon Echo is a wireless speaker and voice command device manufactured by Amazon.com. The device consists of a 9.25-inch tall cylinder speaker with a seven-piece microphone array. The device is capable of voice interaction, music playback, making to-do lists, set alarms, stream podcasts, play audiobooks, provide weather, traffic and other real time information. It can also control several smart devices. It takes inputs by voice commands. Amazon Echo runs on Amazon Web Services.
      There are concerns about the access Amazon Echo has to private conversations taking place in the home, or other non-verbal indications that can identify who is present in the home and who is not based on audible cues such as footstep or radio/television. Amazon responds to these concerns by stating that Echo. The device is technically capable of streaming voice recordings at all times so its very good for security purposes. Also, Echo will always be listening to each and every word uttered by the user so that it detects it. It hears you from across the room even with strong voice recognition even if the music player is being played. it is so efficient. Amazon Echo is always getting smarter which means that its always adding up new features.

Logitech FreePulse wireless headphones

The Logitech FreePulse Wireless Headphones are headphones that use bluetooth to transmit audio from the receiver to the headphones. This means that it is wireless and uses Bluetooth to play audio songs. The receiver can uses a 3.5 mm headphone jack to plug into most audio outputs. The headphones emit sound from up to 33 feet  away from the receiver using Bluetooth 2.0 with Enhanced Data Rate wireless technology. It is also compatible with most music players but can also be connected via an external bluetooth source. so it is very efficient and easy to use.

Quad-core processor

A quad-core processor is a processor or you can say that a quad core processor is a chip with four independent units called cores that read and execute the instructions given by the central processing units CU.
Within the chip, each core operates in collaboration with other units such as cache, memory management, and input/output ports. The individual cores that is one single core in a quad-core processor can run multiple instructions at the same time, increasing the overall speed for programs execution. Manufacturers typically integrate the cores onto a single semiconductor wafer, or onto multiple semiconductor wafers within a single integrated circuit  package.
Although it's very interesting  to suppose that a quad-core processor would operate twice as fast as a dual-core processor and four times as fast as a single-core processor because in a dual core processor there are two cores whereas in a single core processor there is only one core, things don't work out that simply. Results depend on the habits of the computer user, the nature of the programs being run, and the compatibility of the processor with other hardware in the system as a whole. so this means that its not necessary that if a single program takes a few nanoseconds to execute on single core processor than it should take half time to execute on a dual core processor and one fourth time on a quad core processor or so on. The execution of a program depends on the nature of the program being run and many other factors
Quad-core and higher multi-core processor  configurations have become common for general-purpose computing, not only for PCs but for mobile devices such as smartphones and tablets.

Multi-core processor

A multi-core processor is a single computing component with two or more independent actual processing units also known as core, the cores read and execute the programs instructions. The instructions are ordinary CPU instructions  such as add, move data, use I/O processors, ALU and CU helps execute these instructions. On a single-core processor the programs are run on one processor that means on one CPU but the multiple cores can run multiple instructions at the same time, increasing overall speed for the program and increasing the parallel computing. Manufacturers typically integrate the cores onto a single integrated circuit or onto multiple dies in a single chip package. Processors were originally developed on single core but with the advancement of the technology now we are able to make processors on multiple cores it can be 2 or more than 2. Multi-core processor implements multiple programming which means more than one program can execute at a time without interruption, it involves the coupling of the processors now it is up to the manufacturer that he uses tight coupling among the cores or lose coupling among them.
         Multi-core processor has many advantages as well as disadvantages too. The advantages of multi-core processor are that it provides higher performance at lower energy. Multi-core processors are more energy efficient. They execute a program faster and thus take less time. The disadvantages of multi-core processors are that it requires the adjustment of OS support and existing application software. The ability of multi-core processor to increase the performance  of the applications depends on the threads  within the application that is the use of the threads, multiple threads in an application. Besides it disadvantages it is very efficient to use and is used by many computer systems and phones.