For use in the kitchen, bathroom, kitty litter area, boat, camper, automobile, indoor smoking areas and hotel rooms. It comes complete with an AC wall mount power supply for the home and a 12 V cigarette lighter adapter for the boat, car, or camper. For a limited time only – Buy 2 get a 3rd one FREE. – Just enter Qty of 2 and we will automatically send you a 3rd one at no charge. Note: Your order confirmation will say only two pieces but, rest assured, the third one will be included in the shipment at no charge. This unit has adjustable ozone output and fan speed. The DC-12 is primarily designed to eliminate odors. The housing is made of ABS plastic and has been rated “BEST” by highly chemically sensitive people, afflicted by chemical out-gassing. Does not kill mold