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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.
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.