Get continuous, wrist-based heart rate tracking and simplified heart rate zonesTrack steps, distance, calories burned, active minutes, hourly activity and stationary timeAutomatically track your sleep quality and wake up peacefully with a silent alarmAutomatically recognises select activities and records them in the exercise section of the Fitbit appBattery life up to 7 days so you can track all day and night without needing a chargeSee your time in light, deep and REM stages to better understand your sleep quality