When linked to the photo voltaic panel, the fan can run; and can be used on my own via plugging into the computer's USB port. When connected to a photo voltaic panel, the fashion the fan works depends upon the sunlight. When the photo voltaic is irradiated to generate sizzling air, the fan directly rotates to expend warmth in time, ventilate, save the hassle of pulling wires, and it's and extra convenient. There is not any rechargeable battery within the fan; in order for you the fan to paintings at night, you should utilize 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 package content, different merchandise aren't included. Note: Light and assorted displays could cause the color of the article within the picture considerably different from the real thing. The length allowed error is +/- 1-3cm.