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Get the power of continuous heart rate in Fitbit’s slimmest design yet-all day, during workouts and beyond. With heart rate, you can better measure calorie burn, and use zones (Fat Burn, Cardio, and Peak) to find the right workout intensity for your goals. With sleep stages powered by PurePulse heart rate, automatically track your time spent in light, deep and REM sleep and take steps toward a better night’s rest. See how working out more can improve your health by comparing your resting heart rate trends to your activity. Automatically track your steps, distance, calories burned and active minutes with up to 7 days of battery life.
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