Homdox Car Air Purifier,True HEPA Travel USB Auto Air Cleaner with Cigarette Adapter,Sedan Air Freshener Remove Cigarette Smoke,Odor Smell,Bacteria for Small Bedroom,Pets Room,Refrigerator,Traveling Captures 99.97% of allergens with True HEPA filtration including: dust mites pet dander plant pollens and more. With activated carbon treatment removes of formaldehyde within one hour more than 99%.Reduces odors from pets, cooking and smoking with this activated carbon. According to the American Academy of Pediatric Allergy and Immunology Doctors recommend HEPA air filtration to reduce exposure to car asthma triggers The Purifier has an integrated air quality sensor that can detect the presence of odors in the air.This is indicated on the on/off speed button through 3 colors(Green means good air quality,orange means moderate,red means poor). We follow up with every order to be certain that you are loving our product. We want our customers completely happy. Even if our product isn't a perfect match for them. We offer a 100% GUARANTEE. No gimmicks or special bonuses, Just a top quality product. If you have any question,feel free to contact us.