Power Energy Dynamotor For Charging Testing Teaching Dc Miniature Hand-Cranked Small 12v electric generator No need for external power, water or wind can generate electricity, low noise and stable operation. Smooth surface hand-cranked generator, no rust, no obvious scratch. Compact size, light weight, easy to use. Smooth surface hand-cranked generator, no rust, no obvious scratch. Compact size, light weight, easy to use. Energy 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. We strive to provide you with the highest quality product and the best customer experience, if you're not entirely satisfied, please just feel free to contact us at any time.