Better measure calorie burn, understand resting heart rate & more with 24/7 Heart rate tracking and a battery life of up to 7 days (dependent on usage).Choose from 15+ exercise modes like run, bike, Swim, yoga, circuit training and more.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 50M 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 with call, text and smartphone app notifications on your wrist.