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When linked to the photo voltaic panel, the fan can run; and might be used by myself through plugging into the computer's USB port. When connected to a photo voltaic panel, the way the fan works will depend on the sunlight. When the solar is irradiated to generate hot air, the fan directly rotates to dissipate warmth in time, ventilate, save the hassle of pulling wires, and it's and more convenient. There is no rechargeable battery in the fan; if you want the fan to work at night, you should use the power pack. Specification: Solar panel chip: Polysilicon Solar panel power: 5W, 6V Panel size: 14/5 Mini fan: Size: four 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 kit content, different merchandise aren't included. Note: Light and various reveals may cause the color of the thing in the photo somewhat diversified from the genuine thing. The dimension allowed error is +/- 1-3cm.