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SMARTWATHCES

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A smartwatch is a wristwatch with screen and the ability to do much more than tell you the time.They are wearable comuputers,that can  run mobile apps, using a mobile operating system. They can be used as portable media players, with FM radio and playback of digital audio and video files via a Bluetooth or USB headset. Some models, also called 'watch phones', feature full mobile phone capability, and can make or answer phone calls or text messages.

Smartwatches have an electronic visual display,a rechargeable battery and touchscreen. Peripheral devices  include digital cameras, thermometers, accelerometers, altimeters, barometers, compasses, GPS receivers, tiny speakers, and SD card .Software include digital maps, schedulers and personal organizers, calculators, and different watch faces. It supports wireless technologies like Bluetooth, Wi-Fi, and GPS.

How do they work??


Watches can cooperate with an app in a smartphone to carry out their functions,for which they are paired, usually by Bluetooth, with a smart phone. Some of these only work with a phone that runs the same mobile operating system; others use a unique watch OS. Paired, the watch may function as a remote to the phone. This allows the watch to display data such as calls, SMS messages, emails, and calendar invites, and any data that may be made available by relevant phone apps.

SportWatches
In Sport watches, the GPS tracking unit can be used to record historical data.After a workout, data can be uploaded onto a computer or online to create a log of activities for analysis . It has activity tracker features (also known as "fitness tracker"), made for training, diving, and outdoor sports. It also has training programs (such as intervals), lap times, speed display, GPS tracking unit, Route tracking, dive computer, heart rate monitor compatibility, Cadence sensor compatibility, and compatibility with sport transitions (as in triathlons). 

Operating Systems for Smart Watches:

Android Wear,Android OS,WatchOS (developed by Apple Inc.),Tizen,Ubuntu Touch.

Best SmartWatch


Apple Series2-Features:

Built-in GPS

Water resistant-50 metres

Wi-Fi
(802.11b/g/n 2.4GHz)

Bluetooth 4.0

Heart rate sensor

Accelerometer

Gyroscope

Ambient light sensor

Battery:
-Built-in rechargeable lithium‑ion battery

-Up to 18 hours

Magnetic charging cable

USB power adapter

Display::

-Second-generation OLED Retina display with Force Touch
2x brighter (1000 nits)

-Sapphire crystal (stainless steel and ceramic cases)
Ion-X glass (aluminium cases)

-272x340 pixels (38mm)

-312x390 pixels (42mm)








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