When connected to the photo voltaic panel, the fan can run; and can be used by myself through plugging into the computer's USB port. When associated with a photograph voltaic panel, the way the fan works is dependent upon the sunlight. When the solar is irradiated to generate scorching air, the fan straight rotates to dissipate warm temperature in time, ventilate, save the trouble of pulling wires, and it is safer and more convenient. There isn't any rechargeable battery within the fan; if you want the fan to paintings at night, you should utilize the ability pack. Specification: Solar panel chip: Polysilicon Solar panel power: 5W, 6V Panel size: 14/5 Mini fan: Size: 4 inches Power supply: USB plug, 5V USB cable length: 70cm/27 Material: Metal colour: black Package Contents: 1 x Solar Panel 1 x Fan Only the above package content, diverse item aren't included. Note: Light capturing and diverse reveals could cause the color of the article in the picture somewhat varied from the genuine thing. The length allowed error is +/- 1-3cm.