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Fitbit Charge is one of a series of smart fitness trackers from the American company Fitbit. It is characterized by, like its predecessors, simple design. The wristband is equipped with sensor which is able to scan all day activity of the owner, his workout and his sleep activity. Developer highlights long life battery and compatibility with a wide range of devices, from smartphones to PCs. Fitbit Charge is compatible with several operating systems. After pairing with application in mobile phone or another desk, application is able to display customized settings of wristband, important informations about owner’s activity – number of steps, duration of motion and workout, distance, quantity of steps, but also a number of burned calories. Wristband stores these information in application and are long time monitored.<ref name="ref1">http://www.fitbit.com/charge (Retrieved October 20 2015)</ref>
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== Main characteristics ==
Fitbit Charge is a smart wristband for all-day use. It is composed of an elastic strip innocuous to human skin, a metal fastening similar to conventional watches, small rectangular OLED display and sensors for scanning activity of the wearer. Of course there is also displaying the current time. The wristband has a variety of essential functions from the pedometer, which measures the achieved time and distance, to monitoring the user's sleep and a silent alarm. The last useful function is the monitoring incoming call notification. <ref name="ref1" /> Charge model is the basic version of this series. Model Charge HR is equipped in addition to basic functions even heart rate sensor, GPS and display real-time state of activities in an application on your smartphone.
The wristband is durable due to its material. The manufacturer states waterproof to 1 ATM, but only to sweat and rain. It is not therefore suitable for swimming or showering routine. Charge is equipped with three sensors - accelometer records physical activity, its frequency and speed. Altimeter is capable with accelometrem measure together the number of floors achieved per day. Vibrating motor is needed for displaying notifications. In the case of incoming call motor will vibrate slightly to warn holder about the event. However, it is not possible to receive calls directly through the device.
