These small fans fail to circulate cool air around the driver's seat and barely reach my face. When the temperature inside the car is awfully hot, the windows must be opened, or the air conditioner has to be turned on. So, a 5-volt fan with such little power is not a recommended investment. I won't return it mainly because of the hassle of mail. No doubt i could have invested 12 dollars in buying something more useful for my car.