Fitbit Charge 4 Review: Why the Fitness Device Tracks "Active Zone Minutes"
The Fitbit Charge 6 looks like a return to form - The Verge
Got the Charge 6 in the mail today - despite some recent Fitbit hate on here. Feels like a huge upgrade over my nearly 4 year-old Charge 3, feels high quality, cool
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Fitbit Versa 4 review: the good, the bad, the ugly
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Charge 4 heart rate zones inaccurate - Fitbit Community
Introducing Charge 6: Fitbit's new fitness tracker