The Winix T500 features a 360° all-in-one 4-stage air purification system, this unit removes 99.99% of airborne particles as small as 0.1 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 Sensor 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. Activate Sleep mode for quiet, energy-efficient operation.