When connected to the solar panel, the fan can run; and can be used on my very own through plugging into the computer's USB port. When related to a photograph voltaic panel, the manner the fan works will depend on the sunlight. When the solar is irradiated to generate hot air, the fan immediately rotates to deplete heat in time, ventilate, save the effort of pulling wires, and it's safer and extra convenient. There isn't any rechargeable battery in the fan; if you want the fan to paintings at night, you should use the flexibility 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 package content, diversified item usually are not included. Note: Light shooting and various exhibits can cause the color of the thing within the photo slightly diverse from the genuine thing. The dimension allowed error is +/- 1-3cm.