1Cooling and Ventilation: The solar panel fan can push out the hot air and push the cold air in, effectively reducing the indoor temperature and keeping the air fresh. Perfect for small chicken coops, greenhouses, sheds, pet houses, window exhaust on hot summer days. 2Green Energy with USB Port: The mini solar panel fan effectively converts sunlight into electricity, has a long service life, and is green energy. The solar panel can also be used as an emergency power source to charge your devices at any time. The output interface is USB+DC. 3Easy to Use: The cooling fan is powered by solar panels, easy to install, just connect the interface of the solar panel and the fan, and then put it in the sun to use. The solar panel fan runs fast in direct sunlight, and the solar fan runs slower or stops when the sun is weak. 4Waterproof And Long Life: The solar panel is coated to prevent short circuits or damage from rain, and is suitable for outdoor environments. Solar fan has no built in batteries and can only work during the day. 5Safety Protection and Air Circulation System: The fan is equipped with a double layer metal protection net to prevent your hands and small animals from being injured and protect the normal operation of the fan blades.