Tabletop Air Purifier with 3-Stage Filtration eliminates 99.97 percent of pollutants as small as 0.3 microns. Tested in an independent lab according to AHAM AC-1 National Standard. A Pre-filter removes larger particles such as dust and pet hair, a HEPA filter removes airborne micro particles, i.e.; dust mites, allergens, bacteria, and pet dander, and an Activated Carbon Filter reduces household odors such as smoke and aromas from cooking. Air Quality indicator lights change color according to the amount of pollution detected by the particle sensor: Blue = Excellent, Green = Good, Purple = Fair, and Red = Poor. Filters up to a 93 sq. ft. room, 5x per hour. An average CADR (Clean Air Delivery Rate) of 66.4 CFM (Cubic Feet per Minute), Dust: 65.8 CFM, Pollen: 77.5 percent, and Smoke: 55.8 CFM. Touch Controls and 4 settings; Low, Medium, High and Sleep. Shut-off timer with 1, 2, 3, and 8-hour selections, Child Lock, and Replace Filter light indicator with audible sound.