Power supply: USBNoise: less than 36dBColors: X27 white, X27 blue, X27 iron gray, X25 white, X25 blue, X25 iron grayOEM support: YesBuilt-in battery capacity: 2000mA-4000mARated power: 4.1WBuilt-in battery: Built-in batteryOperation mode: mechanicalRated voltage: 5VWind selection: natural windType of air supply: natural wind