1.High density cotton pre-filter can remove different kinds of pollutants such as hair, scurf, fibre, pollen dust, etc. 2.HEPA filter can clear smog, particles and pollen, kill bacteria as high efficiency as 99.97% 3.Active carbon filter can eliminate bad odors, cigarette smog, nicotine and indoor decoration contamination, speed up the decomposition of harmful gases. 4.Photo catalyst filter . 5.UV light sterilization can effectively kill virus…etc. 6.Ozone can kill bacteria, germ, virus which is harmful for our health. 7.LCD display. 8.Fixed 2 fan in both side of our car air purifier, improve the air delivery rate. 9.Aroma cotton: Our car air purifier has a special design of Aroma cotton, can be used as aroma diffuser . 10.Negative ion can improve immunity and adjust human body balance.