[Switching between hot and cold air] The product has the function of alternating hot and cold air, which can meet the defrosting/demisting function of windows and windshields at home. It is a good choice whether in the car or at home. Air freshenerThe portable car heater is 100% brand new and of high quality. It supports air freshening function and uses pressure sterilization, gold removal and other methods to purify the air. Compact designThe product measures only 135x110mm, which is easy to carry and install. It can be installed at the bottom of the seat, footwell or anywhere on the car. Wide ApplicationSuitable for all 12V-24V vehicles, such as cars, trucks, SUVs. The heater has thermal protection and will automatically shut off when the temperature gets too high for your safety. Good GiftsIt can be a birthday gift for your lover, father and your friends, a good gift for Halloween and other festivals, Christmas.