4 Stage Filtration System (Pre-filter, Deodorization filter, True HEPA filter, Vital Ion) captures and reduces up to 99.97% of particles 0.3 microns in the air, including pollen, pollutants and other allergens. It also reduces volatile organic compounds and reduces odor. Coway Mighty pollution sensor communicates indoor air quality in real-time.The brightly colored LED lets you know how clean or dirty your indoor air is every minute of the day. And it features a timer, and filter lifetime indicator. Fan speeds available in 1, 2, 3 stages by manually setting up. While auto mode automatically optimizes the speed setting 1 through 3 based on the level of indoor air quality. When no pollution is detected for 30 minutes, the fan will automatically stop and set as Eco mode to save energy. Timer feature allows the machine to run 1/4/8 hours before automatically powering off. Filter replacement indicator checks both Pre-filter and HEPA filter respectively to let users be aware of when to wash or replace the filter. 77 W power consumption and quiet operation with noise level ranging from 24.4 dB to 53.8 dB. Won the Best Air Purifier of 2018 at Wirecutter and ranked 1st place at the TopTenReviews. This item is in the category "Home & Garden\Home Improvement\Heating, Cooling & Air\Indoor Air Quality & Fans\Air Purifiers". The seller is "bluejyd74" and is located in this country: US.