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2. Heart rate monitor - Wikipedia

   en.wikipedia.org/wiki/Heart_rate_monitor

   X-ray image of a chest strap (left: frontal view; right: side view). Visible is the circuit board, the antenna for data transfer, the battery and the connections to the electrodes in the adjoining belt at picture top and bottom. Modern heart rate monitors commonly use one of two different methods to record heart signals (electrical and optical).

3. Fitness tracker - Wikipedia

   en.wikipedia.org/wiki/Fitness_tracker

   The Fitbit Charge 3 activity tracker. A fitness tracker or activity tracker is an electronic device or app that measures and collects data about an individual's movements and physical responses, towards the goal of monitoring and improving their health, fitness, or psychological wellness over time.

4. List of Fitbit products - Wikipedia

   en.wikipedia.org/wiki/List_of_Fitbit_products

   The Fitbit Classic was a small black and teal device that could be clipped and worn 24/7. It uses a three-dimensional accelerometer to sense user movement. The Tracker measures steps taken as well as user data to calculate distance walked, calories burned, floors climbed, and activity duration and intensity.

5. Fitbit - Wikipedia

   en.wikipedia.org/wiki/Fitbit

   The Fitbit Charge 3, a wristband health and fitness tracker introduced in October 2018, was the first device to feature an oxygen saturation (SPO2) sensor; however, as of January 2019, it was non-functional and Fitbit did not provide an implementation timeline. [44] The Fitbit Charge 3 comes with two different-sized bands: small and large.

6. Wearable computer - Wikipedia

   en.wikipedia.org/wiki/Wearable_computer

   Fitbit released several wearable fitness trackers and the Fitbit Surge, a full smartwatch that is compatible with Android and iOS. On 11 April 2012, Pebble launched a Kickstarter campaign to raise $100,000 for their initial smartwatch model. The campaign ended on 18 May with $10,266,844, over 100 times the fundraising target. [41]

7. Smartwatch - Wikipedia

   en.wikipedia.org/wiki/Smartwatch

   HOT Watch by PHTL features a speaker and microphone on the strap, allowing for calls to be answered on the watch. HOT Watch speaker and microphone embedded on the strap. Magnetic charging pins at left. As of 4 September 2013, three new smartwatches had been launched: the Samsung Galaxy Gear, Sony SmartWatch 2, [65] and the Qualcomm Toq. [66]