One touch auto mode uses a particle sensor to monitor pollutant levels and adjusts fan to ensure optimal air quality; LED indicator displays air quality status as excellent (blue), moderate (orange) or polluted (red). Blueair's HEPASilent dual filtration delivers up to 45% faster cleaning and up to 67% less noise than traditional HEPA filtration alone; Quickly cleans 388sqft medium room in about 12.5 min or up to 1862qft XL space in 60min, on high. Removes 99.99% of pollen, helping reduce allergens and pollutants that trigger allergy and asthma symptoms.