Sleep Tracking Automatically Tracks How Well You Sleep At Night, Get The Data About Your Sleep Trends Through The Night In The App. The Silent Vibration Alarm Clock Can Wake You Up Without Disturbing Others. Intelligent Reminder Vibrates To Notify You Of Incoming Calls And Messages Help You Stay Connected . Never Miss Any Important Message. Swimproof IP67 Index ：It is water and sweat resistant, , so you can wear it even if you are sweating. Or track your swimming related data and running in the rain. It Needs To Be Taken Off Before A Hot Bath. Charging Anywhere Full Charge Requires About 2 Hour And One Single Charge Gives You Up To 13 Days Of Working Time Above.Note: 4 hours of charging is required for first use Smart Function Track Your Daily Steps, Distance And Calories, Helping You Do Exercise Scientifically And Reach Your Goals, Continuous, Automatic, Wrist-based Heart Rate Tracking, Get To Know Your Heart Rate At Any Time And Get A Better Understanding Of Your Fitness Level