Keyboardkeypad connectivity technology wireless keyboardkeypad wireless technology bluetooth keyboardkeypad wireless operating distance 10 m keyboardkeypad features lightweight keyboardkeypad features rechargeable battery keyboardkeypad features usb charging hot keys onoff switch localization english interfacesports keyboardkeypad host interface usb battery information battery chemistry lithium ion li ion maximum battery run time 2 month physical characteristics keyboardkeypad height