3-stage Filtration System with True HEPA filter captures 99% of odors, smoke, pet dander, mold, dust, allergens, pollen, and PM 2.5, filtering particles as small as 0.3 microns to get healthy breathing by air purifier, allergen eliminator, smoke grabbed, and odor remover. Also, protect yourself against harmful pollutants and purify the air. It releases high negative ions and has adjustable fan speeds. Choose from low, medium, or high fan speed settings to meet different air conditions.