-Better measure calorie burn, understand resting heart rate and more with 24/7 heart rate tracking and a battery life of up to 7 days (varies with use and other factors).

-Choose from 15 plus exercise modes like run, bike, swim, yoga, circuit training and more, set a goal, and get real time stats during your workouts to see how you can keep getting better

-Automatically record time spent in light, deep and REM sleep stages and see Activity trends, health insights and personalized guidance in one place with Fitbit today

-Swim proof and water resistant to 50 meters, so you can track swims and wear in the shower; also connect to Smartphone GPS for real time pace and distance during outdoor runs and rides

-Stay connected to your day with everyday apps for weather and more and get called, text and smartphone app notifications on your wrist

-The operating temperature is 10 degree to 45 degree celsius; maximum operating altitude: 8,535 m