When related to the photo voltaic panel, the fan can run; and may be used on my own via plugging into the computer's USB port. When related to a photograph voltaic panel, the way the fan works will depend upon the sunlight. When the photo voltaic is irradiated to generate sizzling air, the fan straight rotates to deplete warmth in time, ventilate, save the effort of pulling wires, and it is and extra convenient. There is no rechargeable battery within the fan; if you want the fan to paintings at night, you can use the ability 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 various reveals may cause the colour of the article in the photograph a chunk various from the real thing. The dimension allowed error is +/- 1-3cm.