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Fitbit publicly announced research results that "measured data" of Fitbit as "inaccurate", Fitbit argues that the result of the research is "inaccurate" - GIGAZINE
How Do Fitbit Trackers Monitor Heart Rate? | Fitbit Health Solutions
Fitbit unveils Sense and Versa 3 smartwatches with Google Assistant | VentureBeat
Fitbit heart rate explained: Accuracy, features and zones - Wareable