Alen A375UV HEPA Air Purifier, 1-Pack Smart-Sensor Technology detects airborne pollutants and automatically adjusts air purification levels Creates an allergy and asthma friendly environment by capturing dust, pet dander, mold spores and pollen from the air Provides pure, breathable air by capturing VOCs (Volatile Organic Compounds) from cleaning products, personal care items and other household materials Covers up to 650 square feet, removing 98% of particles 0.3 microns and greater Versatile filter options address bacteria, heavy odor and smoke concerns