Output voltage: 0.01-5.5V Output current: 0.01-100mA Rated speed: 100-6000 r / min Material :plastic and metal Fan diameter:10cm/3.94in Note : Whether it is used as wind power or hydropower, it must support enough power to the fan rotation fast , then the leds can be bright.To rotate the fan ,you can blow the wind by your mouth , hair dryer or a fan.