A smartwatch is a computerized wristwatch with functionality that is enhanced beyond timekeeping. While early models can perform basic tasks, such as calculations, translations, and game-playing, modern smartwatches are effectively wearable computers. Many run mobile apps, using a mobile operating system.
Some smartwatches function as portable media players, offering playback of FM radio, audio, and video files to the user via a Bluetoothheadset. Some models, also called 'watch phones', feature full mobile phone capability, and can make or answer phone calls.
Internal hardware is various. Most have a rechargeable battery and graphical display and many have a touch screen. Peripheral devicesmay include camera, thermometer, accelerometer, altimeter, barometer, compass, GPS receiver, speaker and SDcard that is recognized as a mass storage device by a computer. Software may include Map display, schedulercalculator, and various kinds of watch face. The watch may communicate with external devices such as sensors, a wireless headset, or a heads-up display.
Like other computers, a smartwatch may collect information from internal or external sensors. It may control, or retrieve data from, other instruments or computers. It may support wireless technologies like Bluetooth, Wi-Fi, and GPS. For many purposes, a "wristwatch computer" simply serves as a front end for a remote system, communicating by various radio technologies..
Smartwatches are advancing, especially their user interfaces and health related applications.
 Many smartwatch models manufactured in the 21st century are completely functional as standalone products. Some serve as sport watches, the GPS tracking unit being used to record historical data. For example, after a workout, data can be uploaded onto a computer or online to create a log of activities for analysis or sharing. Some watches can serve as full GPS watches, displaying maps and current coordinates, and recording tracks. Users can "mark" their current location and then edit the entry's name and coordinates, which enables navigation to those new coordinates.
"Sport watch" functionality often includes activity tracker features (also known as "fitness tracker") as seen in GPS watches made for Training, Diving, and Outdoor sports. Functions may include training programs (such as intervals), Lap times, speed display, GPS tracking unit, Route tracking, dive computerheart rate monitor compatibility,Cadence sensor compatibility, and compatibility with sport transitions (as in triathlons).
Other watches can cooperate with an app in the smartphone to carry out their functions. They may be little more than timepieces unless they are paired, usually by Bluetooth, with a mobile phone. Some of these only work with a phone that runs the same mobile operating system; others use a unique watch OS, or otherwise are able to work with most smartphones. 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.
                                                                               
                                                                                
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