![]() Charge 5: Adds Daily Readiness, Stress Management Score.Charge 4: Adds Spotify support, SmartWake alarms.Charge 3: Activity and sleep monitoring, auto-exercise recognition, multi-sport tracking, smartphone alerts, swim tracking, goal-based exercise, run detect with auto stop, accept/reject calls, Quick Replies, NFC, Active Zone Minutes.While the NFC chip comes as standard on the Charge 4 and Charge 5, though, it's only available in the Special Edition models of the Charge 3. There are seven GPS-enabled exercise modes to choose from.Īll three also have NFC on board, allowing you to pay with your activity tracker at contactless terminals through Fitbit Pay. The Charge 4 and Charge 5, however, offer built-in GPS and result in untethered tracking. This uses your smartphone for the GPS signal, meaning you'll need to bring it with you when you go for a run or walk if you want detailed map data. In terms of location tracking, Charge 3 only offers connected GPS. ![]() These two features, and the accompanying data available in the Fitbit app, make it a much more serious health tracking device than we've seen previously in the Charge lineup. The former is able to detect small changes in your finger's sweat glands, and as a result, stress level changes, while ECG readings are able to detect the heart's rhythm and check for signs of atrial fibrillation. However, the Charge 5 is the only device to feature an EDA sensor and the Fitbit ECG app. They also all have an accelerometer, altimeter and vibration motor.Įach also finds room for relative SpO2 sensors, too, allowing users to view a graph in the Fitbit app to see an estimate of the oxygen level variability in your bloodstream, which is designed to help show variations in your breathing during sleep.
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