6 layers purification filters : High-density cotton pre filter, remove different kinds of pollutants which more than 20 microns , such as hair , scurf , fibre , pollen dust , etc H12 HEPA filter can remove more than 99.97& particale whose diameter is 0.03mm(about1/200 of the hair diameter ), Cold-catalyst filter can absorb and decompose formaldehyde ,break down formaldehyde and other toxic gas into CO2 and H2O. Cotton carbon filter , preliminary adsorption odor. Activated carbon filter can remove organism and pollutant , absorb and eliminate odors and toxic gas , with goods purification effect . Photo-catalyst filter , degradate toxic and harmful gases in the air , effectively kill multiple gsrms and remove odors and stain-resistant. etc . 20million negative ion ,30 minutes after negative ion intake, the lung is able to inhale 20% more oxygen and exhale 14.5% more carbon dioxide,they greatly benefit people's health and everyday routine, which can facilitate body growth and disease prevention . UV sterilization , kill all kinds of microoganism, germ , etc . Ozone disinfection , killing virus and detoxification, prevent infective deceases; remove the odor to purify the air ,make your living circumstance fresh as forest   Auto / Manual / Sleep three working mode . . Low /  Mid / / High / Super high 4 fan speed . Green /  Yellow / Red / Purple four indicator quality indicator . Timer setting :1 / 2 / 4 / 8 Hr timing can choose . Remote control support customer operate it in 10M distance .