Featuring a 4-stage air purification system, this unit removes 99.97% of airborne particles as small as 0.003 microns in size. Winix~s PlasmaWave~ Technology may help to reduce the presence of airborne pollutants, allergens, and impurities. The unit~s built-in Smart Sensors detect and monitor the quality of air in your environment and provides a visual representation of your current air quality. When in Auto Mode, the unit automatically adjusts fan speeds to ensure efficient and cost-effective cleaning. Sleep mode is automatically activated when the room is darkened, providing quiet, energy-efficient operation. The unit~s remote control gives you full control of the unit from anywhere in the room.