Effectively purifies air in a 200 square foot room * AeraSmart Sensor monitors the air quality and automatically adjusts the fan speed to keep your air purified * True HEPA Filter captures 99.97% of airborne particles as small as 0.3 microns * Aera+ Mode for allergy and cold/flu seasons, Fan Speed Indicator lets you manually adjust the fan speed, Filter Change Indicators let you know when it is time to replace filters * Replacement Filters: True HEPA - #9287101, Carbon - #9324101