Product SKU: TNSAFHZ200001 360-degree filtration draws air from every direction Carbon prefilter captures odors and certain gasses, and offers the first level of defense against dust and pet hair Washable prefilter for long-lasting use HEPA Type filter removes pollutants as small as 0.3 microns - that's roughly 30 times smaller than a strand of hair Change indicator light is displayed on purifier when filters need to be replaced Change indicator light is displayed on purifier when filters need