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2. List of Fitbit products - Wikipedia

   en.wikipedia.org/wiki/List_of_Fitbit_products

   The Fitbit Charge 4 is a tracker released in March 2020. [38] It shares the same form factor as the Charge 3, but includes additional features such as in-built Spotify controls, Active Zone Minutes [39] and Fitbit Pay Support. Charge 4 also has built in GPS, and many of the Charge 3 clock faces return. [40] [promotion?]

3. Fitbit - Wikipedia

   en.wikipedia.org/wiki/Fitbit

   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.

4. I wore the Fitbit Charge 6 for weeks — here's what to know

   www.aol.com/news/wore-fitbit-charge-6-weeks...

   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 sleep, menstrual health and ...

5. Sleep tracking - Wikipedia

   en.wikipedia.org/wiki/Sleep_tracking

   Compared to a polysomonograph or an actigraph, consumer sleep-tracking devices are already incorporated into the day-to-day lives of patients and are the most cost-effective sleep-tracking method for patients. [4] However, consumer sleep-tracking devices as they currently are, do not provide reliable sleep data for consumers or healthcare ...

6. Keep tabs on your stress, sleep and movement with the Fitbit ...

   www.aol.com/news/fitbit-charge-5-review...

   The Fitbit Charge 5 fitness tracker makes it easy to track strength workouts and cardio workouts, and the Fitbit's sleep tracking is top notch.

7. Fitbit Charge 6 brings better heart rate tracking and deeper ...

   www.aol.com/finance/fitbit-charge-6-brings...

   Fitbit is rolling out the latest version of its top-of-the-line fitness tracker: the Charge 6. Available Oct. 12 for $159, the Charge 6 comes with updated heart rate tracking that promises ...