dynamotor can be used for backup lighting power supply, charging, testing, teaching, hydraulic generator, etc. Portable hand-cranked generator can be used as emergency power supply. It can be powered by human hand to supply various electronic products. Small 12v 24v electric generator No need for external power, water or wind can generate electricity, low noise and stable Smooth hand-cranked generator, no rust, no obvious scratch. Compact size, light weight, easy to use. Smooth hand-cranked generator, no rust, no obvious scratch. Compact size, light weight, easy to use. Motor output voltage: 5~30V. (unregulated, the voltage varies depending on the hand cranking speed), Weight: 1.10231131 Pounds, Manufacturer: Ehwisbe