Four-stage hospital-type filtration.Effectively cleans small spaces.Detects air quality and automatically adjusts the fan speed to keep your air purified.True HEPA filter with antimicrobial treatment safely removes 99.97% of airborne particles as small as 0.3 microns, including allergens, viruses, and cigarette smoke.Proven to capture the airborne flu virus.Carbon filter removes odors and captures large airborne particulate.Aera+ Mode for allergy and cold/flu seasons.Ultra-quiet operation.