, the hydroelectric generator is metal materials,, with smooth surface, no rust, and no obvious scratches The handheld generator has a structure, low noise, stable working performance, small size, light weight and use Powerful, the hand is 5V-24V 1500mA 20W, it is easy to use Widely application, the hand generators can be used for backup lighting power, charging, testing, teaching, hydroelectric generators Speed regulation instructions, the motor stator winding of the generator is copper wire, and an external speed regulator is required to realize the speed regulation function