Oreck Optimax Medium Room Air Purifier HEPA-Type filter captures 99% of dust, allergens, smoke, pet dander and pollen at 1 micron from the air that passes through its filter Odor filter reduces common household odors and VOCs from the air that passes through its filter OptiMax has a CADR rating of 152 for use in rooms up to 235 SF 3 speeds, Air Revitalizer, 2, 4, or 8 hour Timer, Change filter indicator lights, 3 Year Limited Warranty Smart Panel that senses your touch