Most USB powered 'Air Purifier' in the market are mislabelled ionizer, humidifier or just a aroma diffuser with no function to actually clean the air. Purifier Vehicle is one of its kind with HEPA and activated carbon filtering (commonly use in bigger and expensive air purifiers), ionizer and also aroma diffuser all-in-one device. It is designed with a touch power button and low noise fan. Other than use in vehicles, you can use this air purifier at home too!