The Dog Window Car Vent allows you to keep your car ventilated while you're on the move or when your're parked. Great for giving your dog the ventilation they need. Suitable for most types of car window, this vent fits between the glass and the window frame and is easy to install and remove.Electric Windows:The electric motors are usually powerful so the best way is to raise the window in small steps by nudging the control button or switch until the car vent is secure.The car vent should not be regarded as a security device. Its intended function is to allow fresh air to be admitted to your vehicle and to discourage your pet from putting his head out or attempting to leave the vehicle.Two sizes available (car vents are comfortable adjustable up to the widths below):Medium Suits normal family size vehicles (opens up to 21 inches wide with 6 inch height)Large Suits larger vehicle's with larger windows ( opens up to 37 inches wide with 6 inch height) Features: Size: L, M Color: White, Black, Beige Dimensions: Medium: Up to 21 inches wide x 6 inches high Large: Up to 37 inches wide x 6 inches high Size: L, M Color: White, Black, Beige Medium: Up to 21 inches wide x 6 inches high