When related to the photo voltaic panel, the fan can run; and might be utilized by myself by means of means of plugging into the computer's USB port. When related to a photo voltaic panel, the style the fan works is determined by the sunlight. When the solar is irradiated to generate sizzling air, the fan instantly rotates to dissipate warmth in time, ventilate, save the effort of pulling wires, and it is and more convenient. There is not any rechargeable battery within the fan; if you'd like the fan to paintings at night, you need to use the power 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 equipment content, different products will not be included. Note: Light and diversified reveals may cause the color of the item within the photo barely varied from the genuine thing. The measurement allowed error is +/- 1-3cm.