AGPTEK Anion Car Air Purifier for Car Travelling and Home Use (Need an Additional 12V DC, not Included), Air Freshener Adsorption of Dog Odors, Cigarettes Smoke etc. (Black) No more smelly. Generate clean anion which will soon be adsorption of dog odors, cigarettes smoke etc., keep fresh clean air in your vehicle Easy to use. Just directly put it into the cigarette lighter of your car to start its function, please make sure it is connected well LED light stays blue to let you know that it is working, it turns off when the car is powered off, no worry about the potentially cause heat With an additional DC12V (not included), the product can provide care for you even at home. Please note that trucks and trains whose cigarette lighter is 24V, are not compatible with this product ? Dimension: 4.29*1.81*1.81(inch), weight: 1.76oz. Compact and convenient for use