Fitbit Charge 3 Fitness Activity Tracker

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