Juboury Universal Bluetooth Smart Activity Watch Wearable Fitness Tracker Bracelet Smart Wristbands with Pedometer Sleep Tracker (Dark-black) Host comes with a standard USB port, special design to charge through connecting PC and mobile driver. Sync data via Bluetooth with iOS and Android smart phones. NOTE : OS must be IOS 7.0(or above)and Android4.3(or above)phone which with Bluetooth 4.0/4.0+. Smart wristband with OLED screen, show the steps, Calorie, Distance,Time. Sync sports data with apple and android device:Go to App store or Google Paly store, download the APP/APK: "Zeroner"and install it. Wakes you (and not your partner) with a silent wake alarm.