Coway Air Purifying System The Coway AP-0512NH small in size but mighty in power. Vital Ion boosts cleaning power and freshens the air by negative ions and the HEPA filter captures up to 99.97% of allergens as small as 0.3 microns. Conway air purifiers help you better by decreasing airborne dust, filtering out pet odors and dander, pollen, and secondhand smoke. Fitration and SoundFeaturing a odor filter, HEPA filter, and Ionizer, this air purifier is ideal for allergy sufferers. It eliminates pollutants and includes a clinically proven sound therapy developed by doctors with 6 sounds including 3 natural, 2 lullabies, 1 white noise. Compact DesignTaking up minimum space and providing maximum efficiency, this unit is a great choice. Offering a slim, contemporary design that looks great virtually anywhere and compact styling to fit on any surface, this unit is ideal for college life, home life, or work. Special Features Include3 stage airflow control ( 1 / 2 / 3 )Filter life: 6 mo. odor and 1 year HEPAAirflow ( 1 / 4 / 8 ) hour timer5 sound volume levels Family Room Coverage Ideal for pet owners, allergy/asthma sufferers, air quality control, work, college living, and secondhand smoke, this Coway AP-0512NH air purifier offers an extended reach to effectively clean up to 155 square feet of space. It has the capacity to cover an average living room, family room or media room. CADRThe CADR rating guarantees superior perfromance. This unit has been tried and tested to remove smoke at 100 CADR. Secondhand smoke is a thing from the past. If you live with a smoker or have one for a neighbor, the airborne odor and harmful pollutant will be easily eliminated. Particle SensorThe Coway AP-0512NH keeps your indoor air cleaner than ever using particle sensor technology. This type of technology detects current air quality and operates accordingly. Auto mode automatically adjusts the airflow speed based on the air quality level.