Battery type: 2 x AAA (not included) Transmission and control: 2.4G wireless Power consumption: about 10mA (under working condition) Microphone power consumption: about 20mA Supported operating systems: for windows, Android and MAC OS, Linux, etc. Please note: The voice function can only be using after the controller needs be successfully paired with the TV. Number of keys: 29 Remote control distance: about 10m Material: plastic colour: black