Made of source material, durable and pratical. Professional designed for education and DIY use, also it can light up max 12V 6W LED light. You can use it to DIY an small size windpower or hydroelectric power generator as you like. Features - Color: As Shown. - Material: Metal. - Length: 4 x 2.7 x 3cm. - Shaft size: diameter 3mm x length 31.5mm. - Line length: about 70mm (exposed part). - Voltage: 3V-24V. - Current: 0.1A-1A. - Rated speed: 300-6000 rpm. - Rated power: 0.5-12W. - Made by material, durable and provide long service life. - Brushless technology, more larger power generation, low noise, wear resist, long service life. - It is suitable for hand-cranked radio, flashlight, mobile phone, 3V, 6V, 9V, 12V battery manual charging or other electronic products manual charging use. - Also it can be use as an professional education tool. - Warm Tip: Dear buyer, Due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand Thank you