-Holmes Desktop Air Purifier with HEPA-Type Filter & Optional Ionizer -Operates quietly to help remove common household odors and up to 99.% of airborne particle such as pollen, dust, mold, pet dander and smoke, providing relief from odor and irritants in the air. HEPA type filter captures particles as small as 2 microns so you can breathe comfortably. Includes one Aer1® filter featuring the odor eliminating power of Baking Soda. 3-year limited warranty. HEPA-type filter helps remove up to 99% of airborne particles Uses Aer1® filter, the most effective filter technology available(1), enhanced with ARM & HAMMER™ (6) baking soda to help eliminate odors Optional ionizer assists in particle removal 3 speed settings to keep air fresh and pure Recommended for rooms up to 109 square feet or 10' x 11' - goes 40$ retail price didn’t have it for long I change work so don’t need it still good as new