Solar-auto-cool Solar Powered Car & Truck Window Cooling & Vent Fan Needs no Batteries - Solar Powered Blows Hot Air Out of Parked Car Flexible and weatherproof window strips attach the unit to the top of one of your car's windows. Air-circulating fan fits all models of cars, truck and SUVs. Measures 6" x 4" x 2-1/2" and is made of plastic.