BEST AIR PURIFIER IN USA: The Airmega Mighty was named Best Air Purifier for eight consecutive years (2015-2022) by Wirecutter, New York Times. COWAY FILTRATION: HyperCaptive Nano Air Filtration: Removes up to 99.999% of particles of 0.01 micrometre including pollutants, dander, pollen, smoke, smell. AUTO & ECO MODE: Automatically adjusts fan speed based on air quality and Eco Mode stops the fan if air quality stays good for 30 minutes and restart when air quality gets bad to save energy. COWAY: Specialists in air purification since 1994. The Airmega Mighty (AP-1512HH) is our signature air purifier that has been selected as the overall top-pick by Wirecutter, New York Times. Mighty is equipped with user-friendly functions of Auto Mode, Filter Change Notification, and Indoor Air Quality Indicator. Eco Mode is an energy-saving mode that makes fan to stop when the air is clean for 20 minutes and restarts automatically when air quality goes bad. Mighty covers 109 square metres efficiently and effectively along with vital ionizer that spreads negative ions so that dust, allergen particles better stick to the filter and gets filtered. New York Times Wirecutter has quoted "Best Performing, Most Durable and Most Economical." Enjoy 24/7 fresh air with Coway.