TRUE HEPA FILTRATION: Effectively filter out 99.97% of airborne pollutants up to 0.3 microns, including bacteria, smoke, mold spores, and pet dander. SIMPLE CONTROLS: The push button controls allow you to select between 3 speed settings or activate the ambient night light with a LED filter replacement indicator. 3-STAGE FILTRATION: The Pre-Filter purifies the air from larger particles. The True HEPA Filter effectively filters the allergens, and the Activated Carbon Filter captures odors and prolongs HEPA Filter life.