The Auto Fan Solar Powered Fan is a ventilator to help cool your car on the hot day. The vent unit is designed to be secure onto the top of a car window Extract the hot air from inside to help cool the interior of the car. Your Parked Car is kept Cooler & the air fresher!! It maintains a safe, comfortable temperature level for your return It installs in seconds; and fix with all car windows Place Auto Fan vent on top of window, then close window and lock up. Fresh air is drawn in; while the hot, stale air vents out Auto Fan even helps to eliminate pet and tobacco. NOTE: Car Solar fan Does not Work on Tinted Windows , also as its solar , It will work only when it Gets solar Energy. It does not Cool your car , but it prevents car from Overheating. Its solar panel uses sunlight - NOT the car's electrical wiring or batteries