This is a 12-volt 80 Watt DC Motor Fan that is designed to work with a solar panel. Keeps the house cool and ventilated with fresh air circulation all day. This is great fan for Camping, outdoors, RV and home. It can be installed in the window or portable so it can be carried outdoors. The dimension of the fan is 20" x 20" x 3" design produces maximum air flow. The fan can be installed any where in the room and connected with the solar panel. 25-year warranty. Full refund if the product is defective.