[Solar Exhaust Fan]: 20w 12v Solar Panel with USB Out Put Port It can be used conveniently and quickly outdoors anytime, anywhere [Wide Applications]suitable for kitchens, greenhouses, pet houses, chicken coops, tree houses, etc., to maintain a comfortable temperature level [Working all day]The fan is equipped with a USB adapter, if you need the fan works at night, you can use a power bank and it can be used continuously day and night (The solar panel runs the fan fast under direct sunshine.the solar Fan working more slow or stops working when the sunshine is weak) [Maintain Air Circulation] This portable exhaust fan can effectively help you maintain indoor air circulation. Keeping the air clean can help you the odor of pets, tobacco, etc [Easy to Install]The USB cooling fan is powered by a solar panel. It is easy to install, just connect the interface of the solar panel and the fan and put it under the sun to use. Power: 20w Fan size: 12x12 cm Voltage: 12 V Current: 800MA Interface