Host comes with a standard USB port?? special design to charge through connecting PC and mobile driver.</br>?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 4.1.</br>?Smart wristband with OLED screen?? show the steps?? Calorie?? Distance?? Time clearly.</br>?Sync sports data with apple and android device:Go to App store or paly store?? download the APP/APK: "r"and install it.</br>?Wakes you (and not your partner) with a silent wake alarm.</br></br>Product Description</br></br><b>Hardware Features:</b> <br> Material: Host Material ABS?? TPU strap material <br> Battery: lithium polymer battery <br> Charging: USB charging sta