The air purifier for the small room has1st a Pre-filter → 2nd Activated carbon filter → 3rd True HEPA filter. Large particles of impurities & odors & tiny impurities are sequentially removed from the air in 99.98%. Mini air cleaner has only 22 DB in Quiet mode/level 1. As quiet as a library, the quiet mode will not disturb your baby's sleep and rest and purify your air at the same time. In the two-button operating system, One button is used to turn on and off, and the other button is used to adjust the speed. There are three speeds: quiet mode/level 1, normal mode/level 2, and fast mode/level 3. The motor of the air purifier is the latest and powerful type, the dust filter for your room will only take 15 minutes to completely purify 6~20m² ( CADR 70m³/h). We will provide the most comprehensive service for all customers, if the small air purifier has any question, please contact us in time, we will reply within 24 hours.