- The minimum and maximum circumference range between 170-206 mm
- 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, Sync stats wirelessly & automatically to computers and 200+ leading iOS, Android and Windows devices
- Automatically track your steps, distance, calories burned and active minutes with up to 7 days of battery life
- Tap to see your stats, time & notifications on an OLED display, plus customize your clock face
- Operating temperature: 14 degree to 113 degree fahrenheit Maximum operating altitude: 30,000 feet
- Made of a flexible, durable elastomer material
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