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Last update was on: July 18, 2022 2:26 pm
- Get the power of continuous heart rate in Fitbit's slimmest design yet-all day, during workouts and beyond. Sizes - Small: 5.5–6.7 inches(140 mm–170 mm), Large:6.7–8.1 inches(170 mm–206 mm), X Large: 8.1–9.3 inches(206 mm–236 mm)
- 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. Syncs with Mac OS X 10.6 and up, iPhone 4S and later, iPad 3 gen. and later, Android 4.4 and later, and Windows 10 devices. Syncing range- Up to 6.1 m