Features: Small size, easy to carry.Power generator strong Dynamo generator, the greater the speed of shaking the greater the power, the maximum power of about 20w A variety of interfaces, are free to choose Anti-skid pads, easy to shake fixed.High-quality shaft, saving time and effort Specification: Material: Metal Color: Blue Max power: 20W Rotating speed: 2000rmp/min Size(L*W*H): 125*80*85mm(4.92 inch X 3.15 inch X 3.34 inch) Voltage/Current: 3V/6.6A, 5V/4A,6V/3.3A, 9V/2.2A,12V/1.6A, 15V/1.3A Package Contents: 1 x Generator 1 x User manual Note: Internal does not store power Before using the USB interface, be sure to set the voltage to 5V Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Features: Small size, easy to carry.Power generator strong Dynamo generator, the greater the speed of shaking the greater the power, the maximum power of about 20w A variety of interfaces, are free to choose Anti-skid pads, easy to shake fixed.High-quality shaft, saving time and effort