• Utilize 24/7 heart rate to more accurately track calorie burn, resting heart rate & heart rate zones during workouts
• Track all day activity, including steps, distance, hourly activity, active minutes and calories burned
• Automatically track sleep, plus due to the heart rate feature, get more insights into your light, deep & REM sleep stages
• Enjoy up to 5 days of battery for daily progress without constant charging. Varies with use and other factors. Charge time (0 100%): Two hours
• Automatically and conveniently record workouts like walks, swimming & bike rides in a snap with SmartTrack.Stores heart rate data at 1 second intervals during exercise tracking and at 5 second intervals all other times
• Radio transceiver: Bluetooth 4.0. Fitbit Inspire and Inspire HR are water resistant to 50 meters. We do not recommend wearing Inspire or Inspire HR in a hot tub or sauna. Operating temperature: 14 degree to 113 degree Fahrenheit. Maximum operating altitude: 28,000 feet