Coway Airmega 150 True HEPA Air Purifier with Air Quality Monitoring, Auto Mode, Filter Indicator (Dove White) open box new selling for only $90 retails for $170 plus tax [Coverage] Designed to clean spaces up to 214 sq. ft. in 12.5 minutes or up to 518 sq. ft. in 30 minutes [HyperCaptive Filtration System] Combination of a pre-filter, deodorization filter, and True HEPA Filter reduces 99.999% of 0.01-micron particles, including pollen and other allergens. It also reduces 99% of volatile organic compounds and odor [Catridge Design] Some purifiers make a dusty mess when trying to replace or clean your filters. With Coway's cartridge design, it's easier and cleaner than ever to remove and replace filters since they are contained on one portable cartridge [Easy Touch Display] You have control with a touch of a button-including fan speed, power, light on/off, and filter reset [Auto Mode] Constantly monitoring the air quality, the fan automatically adjusts to most effectively purify your space as needed providing a new level of clean in real time [3-Stage Manual Fan Speed] Control your Airmega 150's fan manually with low, medium, and high settings [Air Quality Indicator] Pollution sensor communicates indoor air quality in real-time. Brightly colored LED lets you know how clean or dirty your indoor air is every minute of the day. You can turn off the light for sleeping [Filter Alerts] The air filter indicator tells you when the filters need to be replaced, and the pre-filter needs to be cleaned for maximum efficiency, based on how much air they have processed [Ultra Quiet] Ultra quiet operation with noise levels ranging from 19 dB to 48 dB