smart functiontrack 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 | sleep tracking automatically track 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. | ip68 waterproof index of the tracker helps you care free while swimming, diving or taking a shower. it only needs to be taken off before a hot bath. | charging anywhere built in usb charge(no cable needed).full charge requires only about 2 hour and one single charge gives you up to 5-7 days of working time.above. | intelligent reminder & wider compatibility vibrates to notify you of incoming calls and messages help you stay connected . never miss any important message. supports a wide selection of android and ios mobile devices, install the app “runmifit” in your phone and pair the device from it. check all your personal health data from the app at anytime or anywhere. (require: ios 9.0 & android 4.4 above)