Designed to blow the hot air out of a parked car Can be fixed to seat back header Keeps car cool no matter how long it is left in the sun Reduce the use of air-condition Solar powered and no batteries needed Fit any car windows Compatible with any cars Auto cool is a solar powered fan that keeps the interior of your car cool and fresh No batteries and are needed Just roll down the window， place the auto cool on it and roll it back up The solar panels on the outside collect and use the sunlight to run the fun that’s on the inside The fan in the auto cool circulates the air that’s inside and outside the car Vents out hot air Designed for use in parked cars only. It is not intended for use while driving as it may obscure your vision.