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Fitbit Charge 4. The Fitbit Charge 4 is a tracker released in March 2020. It shares the same form factor as the Charge 3, but includes additional features such as in-built Spotify controls, Active Zone Minutes and Fitbit Pay Support. Charge 4 also has built in GPS, and many of the Charge 3 clock faces return. [promotion?]
A 2019 study found that the Fitbit Charge 2 accurately measures the average heart rate of healthy adults during sleep, and that it is most accurate for medium range of heart rate. However, the same study found that Fitbit Charge 2 relative to EEG, overestimated sleep efficiency by about 4%, but there was no difference in measured total sleep time.
Fitbit Charge 6 $ at Best Buy. The Fitbit Charge 6 ($159.95) is a small fitness watch that can track your heart rate, daily steps, distance traveled, fitness activities, calories burned, nightly ...
Fitbit Charge 6 $ at Walmart. 4.1-star average rating from 6,593 reviews on Amazon. One of our favorite fitness trackers and an NBC Select Wellness Award winner, the Fitbit Charge 6 is lightweight ...
Fitbit Charge 6 $ at Target. 4.3-star average rating from 165 reviews at Walmart. The Fitbit Charge 6 is an NBC Select Wellness Award winner because it’s lightweight, easy to use and compatible ...
The Fitbit Charge 3 activity tracker. An activity tracker is an electronic device, or an app on a device, 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.
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