Air Purifier (NBO-J001, White), Pre-Filter Activated Carbon Cold Catalyst, HEPA Filter for Home, Office, Baby Room air Cleaner, Odor Allergies Eliminator for Smokers, Smoke, Dust THREE-IN-ONE COMPOSITE FILTER(composed of pre-cotton,activated carbon and cold catalyst) to efficiently remove kinds of pollutants in the air,handy to be replaced. Photocatalyst Cold catalyst: Nanoscale advanced tech materials, Strong catalytic degradation function, which can effectively reduce formaldehyde, benzene, toluene, ammonia and some other harmful gas and release the negative oxygen ion. Compact and Desktop Design: Easy to replace HEPA filter net and with Aromatherapy cotton in Essential oil tank. Brings fresh clean and fragrant air to your whole room. Create a Safe Environment: Provide an antistatic environment and reduce computer radiation. This means that you can reduce the damage of your computer do to your body. In fact, you will be healthier than in the past, because the computer will not be harmful to you. Non-Toxic:The air purifier uses HEPA and active carbon filters,100% Ozone free, does not use UV or Ions which produce trace amounts of measurable ozone, a harmful air pollutant.Removing micro-organisms and pollutants,while eliminating unpleasant odors.making it 100% safe for the entire family,and is entirely eco-friendly. Here, bacteria, pet dander, mold, and fungi are filtered out. Fine Preliminary Filter is on the other side of True HEPA Filter. The HEPA filter then tackles dust, mites, large particles, and pollen. Finally, take care of lingering odors around the house, including tobacco smoke and cooking smells.