Features: brand new and high quality The handheld for DC generator has a solid structure, low noise, stable working performance, small size, light weight and convenient use. Widely application,the for DC hand generators can be used for backup lighting power, charging, testing, teaching, hydroelectric generators, etc. High quality material,the hydroelectric generator is made of high-quality metal materials, durable, with smooth surface, no rust, and no obvious scratches. Speed regulation instructions, the motor stator winding of the for dc generator is copper wire, and an external for dc speed regulator is required to realize the speed regulation function. Powerful ,the hand dynamo is for DC 5V-24V 1500mA 20W,it is easy to use . Specifications: Material:Alloy Size:13035mm/5.111.38inches Note: Please allow 1-2cm errors due to manual measurement. Due to the difference betweeen different monitors,the pic may not reflect the actual color of the item. Package includes: 1 Piece Hand Dynamo