Household Air Purifier with Silent Operation and Speed Control Function Combines the top few technologies in one purifier UV and TiO2 features a photocatalyst oxidation effect, killing most germ, bacteria, mold spores and effectively eliminating the VOCs Plasma filter kills essentially all bacteria, mold spores, viruses and VOC in the air with its powerful electric field Fiber active carbon filter helps to remove the odor in the air circulation Independent negative ion generator with UL certification and releases more than 3,000,000 ions/cc to improve the air quality Speed control: low, medium, high and three different speeds for different environment and time Timer control: the machine can be switched off automatically in 2, 4 and 8-hour interval Remote control