Demetory OLED Smart Healthy Bracelet Watch Wristband Heart Rate Sport Gym Fitness Tracker Passometer WristWatch Phone Mate Supports Android 4.3 or Above IOS 7.0 or Above Syncs via Bluetooth with iOS and Android. Light Weight;Touch design;NOTE : OS must be IOS 7.0(or above)and Android4.3(or above) Build-in integrated Bluetooth 4.1 and 3D accelerated sensor, with APP and PC cloud service,track your daily activity: steps, calories and sleep faithfully Light Weight, easy to operate ,Waterproof IP67, 0.91 inch OLED screen for information watching Smart wristband with OLED screen, show the steps, Calorie, Distance, Time, Sleep quality clearly Sedentary remind, Monitor if user sedentary for a long time, the bracelet will vibrate to remind user to move