Solar Auto Fan Prevents heat build-up while parked. The fan blows hot air out as it draws fresh air in. Help to eliminate pet and tobacco odors. Fit any car window. No batteries are required. A fan blows hot air out as it draws fresh air in. The auto vent cooler is deluxe and should not be used on cars that do not have a door frame above the window. Fit any car window. No batteries are required. Includes: 1 x Auto Fan Solar Powered Ventilation System Disclaimer: Do not use tinted windows. Leave a crack in the windows opposite the fan. Remove the fan while driving. Additional Details ------------------------------ Product description: Solar Auto Fan Prevents heat build-up while parked. The fan blows hot air out as it draws fresh air in. Help to eliminate pet and tobacco odors. Fit any car window. No batteries are required. A fan blows hot air out as it draws fresh air in. The auto vent cooler is deluxe and should not be used on cars that do not have a door frame above the window. Fit any car window. No batteries are required. Includes: 1 x Auto Fan Solar Powered Ventilation System Disclaimer: Do not use tinted windows. Leave a crack in the windows opposite the fan. Remove the fan while driving.