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When related to the photo voltaic panel, the fan can run; and can be used on my very own by way of plugging into the computer's USB port. When associated with a photo voltaic panel, the style the fan works depends upon the sunlight. When the photo voltaic is irradiated to generate hot air, the fan immediately rotates to dissipate heat in time, ventilate, save the trouble of pulling wires, and it is and extra convenient. There is not any rechargeable battery in the fan; if you would like the fan to work at night, you can 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 package content, assorted merchandise should not included. Note: Light and diverse displays can cause the color of the article in the picture a bit varied from the genuine thing. The size allowed error is +/- 1-3cm.