Oreck AirInstinct 75 Smart Air Purifier Smart Air Sensor Technology constantly monitors particulate levels in the air passing through the sensor and automatically adjusts the fan speed. 2 Year HEPA filter captures 99.97% of dust, allergens, pet dander, mold, smoke and pollen at .3 microns from the air that passes through the filter 1 Year Odor filter reduces odors and VOCs from the air that passes through the filter 3 speeds including auto with optional air revitalizer & a clean filter indicator light Energy Star Qualified with a 1, 4 or 8 hour timer