All battery positive and negative electrodes are made of high-quality silver paste with high welding strength and low series resistance. It has a polycrystalline solar cell A-level chip, which can be used in mobile phones, power , etc. Using advanced polyethylene coating technology, the battery is sealed with epoxy resin and the color is beautiful. Scratch-, non-foaming, easy to clean. When connected to the solar panel, the fan can run; and can be used alone by plugging into the computer's USB port. When connected to a solar panel, the way the fan works depends on the sunlight. When the sun is irradiated to generate hot air, the fan rotate immediately to dissipate heat in time, ventilate and ventilate, save the trouble of pulling wires, and and more convenient. There is no rechargeable battery in the fan; if you need the fan to work at night, you can use the power pack. Suitable for car batteries, cars, RVs, ships, airplanes, satellites, space stations, outdoor breeding, planting, tourism, solar street lights. Color:As Shown Material:Plastic Package Contents: 1 * solar panel 1 * fan 4 * suction cup 2 * buckle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.