Meet the Coway Airmega 240The simple, clean, and compact Airmega 240 air purifier features three-stage filtration combining a pre-filter, an Activated Carbon filter, and a Coway Green True HEPA™ filter to reduce contamination in the air.The Airmega 240 includes filter change indicators, easy-to-pull filters, automatic speed control based on particles in the air, and an intuitive air quality indicator with a light that can be turned on or off. Maintain pure air in spaces up to 403 square feet.*Based on the Green True HEPA™ filter media standard. The actual performance will be determined by indoor air quality and the operation of the unit.