AIR QUALITY SENSOR - Monitors and detects impurities and auto-adjusts fan speed to ensure air is always clean HIGH EFFICIENCY FILTER - Removes common allergens and air impurities like pet dander, pollen, smoke and dust to keep the air in your room healthy and pure ACTIVATED CARBON FILTER - Helps to remove common household odors from sources like pets, smoke and cooking, leaving your home smelling fresh. For optimal performance, we recommend replacing the filter cartridge once every 3 months PURIFIES SMALL ROOMS UP TO 95 SQ FT- Efficient yet powerful filtration is perfect for a bedroom, nursery, kid's room, office or anywhere in the home ULTRA-QUIET - Operates at sounds as low as 25 dB, delivering maximum comfort with minimum noise