TWO UNITS of 3Q AP08 IONIC AIR PURIFIER PRO IONIZER OZONE CLEANER with UV No costly filter to replace. The Charcoal filter is washable and the steel collection cartridge can be removed simply and wiped clean with a damp cloth. Innovative design combines an air purifier with a soothing night light. The Charcoal filter works firstly as a pre-filter to coatch large particles, pollutants and removes odor. High electrostatic plate traps the dust, pollen, smoke etc.as small as 1 micron circulated in the air. A pair of super quite fans with three-speed control prompts a large airflow without distractive noise. Powerful UV-C germicidal lamp destroys microorganisms such as germs, viruses and bacteria, and helps create a healthier environment. 3Q AP08 Air Purifier is efficient to eliminate airborne contaminates such as dust, pollen, mold, smoke, pet dander, and bacteria, germs, allergens. NOTE: The Charcoal filter works firstly as a pre-filter prevent large particles, pollutants and removes odor. The air purifier remits negative ions to fresh the air and UV light kill germs etc., Negative ions are odorless, tasteless, and invisible molecules. The ESP collects dust as small as 0.01 micron. In case if the fan is making noise, it means there is too much dust on the fans. Please clean the fan by holding a piece of soft paper inside the blades of the fan while it runs on low speed. The ESP also needs to be cleaned every week following the manual. PLEASE NOTE: The UV light is behind the ESP filter and its also has an metal cover, its hard to see it, you can try to see a little blue light through the air vent when it runs in dark environment.