Filters Up To 99.9% of Pollutants, Smoke, Pollen, Dust - Quiet HEPA Air Filter - Air Purifiers for Bedroom. 

• QUIETLY CLEANS 24/7: A smart particle sensor monitors air quality and increases power if polluted air is detected. Set it and forget it! Perfect air purifiers for bedroom, with a built in sleep mode that operates quietly. Designed to be used 24/7