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When related to the solar panel, the fan can run; and may be used alone by plugging into the computer's USB port. When associated with a photo voltaic panel, the way the fan works is dependent upon the sunlight. When the photo voltaic is irradiated to generate hot air, the fan instantly rotates to burn up heat in time, ventilate, save the trouble of pulling wires, and it's and extra convenient. There is no rechargeable battery within the fan; if you want the fan to paintings at night, you can 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, diversified products are usually not included. Note: Light and diverse reveals may cause the colour of the article in the picture a piece varied from the genuine thing. The size allowed error is +/- 1-3cm.