AeraSmart Sensor monitors the air quality and automatically adjusts the fan speed to keep your air purified. True HEPA filter with AeraSafe antimicrobial treatment safely removes 99.97% of airborne particles, including pollen, ragweed and other allergens, viruses, germs, dust mites, mold spores and cigarette smoke. Ultra quiet operation. Filter Change Indicator. Purifies air in a 90 square foot room. Colour: Black.