Long-Life TRUE HEPA Filter Lasts Up-To 2 Years/ Max, Med, Sleep Modes, Plus 60-Minute Express Clean/ CADR Dust / Smoke / Pollen: 101, 92, 109/ The Library Quiet, Sleep Setting Is Perfect For The Bedroom Or Home Office (As Low As 23 dba)/ Auto-Resume Feature Remembers Your Last Setting Between Uses/ ENERGY STAR Rated/ White Finish