Features: The fan runs when connected to a solar panel; and can be used alone by plugging into a computer USB port. When connected to a solar panel, the way the fan works depends on sunlight. When the sun shines to generate heat, the fan rotates immediately, dissipating heat in time, ventilating and ventilating, saving the trouble of pulling wires, making it safer and more convenient. There are no rechargeable batteries in the fan; if you need the fan to work at night, you can use a power pack. Technical parameters: Solar Panel Power: 5W, 6V Panel size: 14.5cm x14.5cm Net weight: 100g Board + fan: 350g Mini Fan Size: 4 inches Material: Iron Power supply: USB plug 5v USB cable length: 70cm Color: Black Package Contents: 1 x Solar Panel 1x4 inch fan Only the above package contents, other products are not included. Note: Light shooting and different display methods may cause the color of the item in the picture to be slightly different from the actual item. Measurement tolerance is +/-1-3cm.