Winix 9800 4-Stage True Hepa Air Purifier with WiFi and PlasmaWave, 500 Sq Ft,Black,LargeFeaturing a 4-stage air purification system, this unit removes 99.99% of airborne particles as small as 0.003 microns in size. Winixs PlasmaWave Technology may help to 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 speeds to ensure efficient and cost-effective cleaning. Sleep mode is automatically activated when the room is darkened, providing quiet, energy-efficient operation. The WiFi feature allows you to connect your air purifier to the Winix Smart App and monitor the air quality in your home, control your Air Purifier, and track filter life.