Nimomo Solar Panel 5W Mini Solar Panel with Portable Cooling Fan Photovoltaic Solar Panel Set for Greenhouse

The fan starts to operate when plugged to the solar panel and it can also get power from other USB devices, such as power bank, computer, etc. Portable, small size, easy to carry around. No batteries needed, super silent and green energy, environmental protection. There is no rechargeable battery in the fan. If you need the fan to work at night, you can use the power pack. When connected to a solar panel, the way the fan works depends on the sunlight. When the sunlight is strong, the fan works quickly.