When associated with the photo voltaic panel, the fan can run; and may be used on my very own via approach of plugging into the computer's USB port. When associated with a photo voltaic panel, the way the fan works will rely upon the sunlight. When the sun is irradiated to generate sizzling air, the fan instantly rotates to use up warmth in time, ventilate, save the trouble of pulling wires, and it is and additional convenient. There is no rechargeable battery within the fan; if you would like the fan to work at night, you should use 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 equipment content, diverse products will not be included. Note: Light and different reveals could cause the colour of the thing in the photo barely diversified from the genuine thing. The measurement allowed error is +/- 1-3cm.