Featuring a 360° All-in-One 4-stage air purification system, this unit removes 99.97% of airborne particles as small as 0.3 microns in size. Winix?s PlasmaWave Technology creates Hydroxyls which help reduce the presence of airborne Bacteria and Viruses. The units 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 speed to ensure efficient and cost-effective cleaning. Activate Sleep mode for quiet, energy-efficient operation.