When linked to the photo voltaic panel, the fan can run; and might be used by myself by way of plugging into the computer's USB port. When connected to a solar panel, the style the fan works will rely on the sunlight. When the solar is irradiated to generate hot air, the fan directly rotates to expend warmth in time, ventilate, save the trouble of pulling wires, and it is and more convenient. There is no rechargeable battery in the fan; while you would like the fan to paintings at night, you can 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 equipment content, other products aren't included. Note: Light and assorted reveals may cause the color of the thing in the photo a chunk assorted from the genuine thing. The measurement allowed error is +/- 1-3cm.