Brondell O2+ Source Air Purifier with True HEPA and Carbon Filtration for Odor and VOCs (Black) Three-stage advanced purifier system includes certified True HEPA and Granulated Carbon technology Simple intuitive touch technology control panel and inspired minimalist design integrates into any home Air quality indicator with color specific LED indication & automatic filter change indicator Four operating modes allow adjustability to accommodate any needs: Auto Mode, Night Mode, Fan Speed Mode, & Eco Mode Whisper quiet operation, Ozone free filtration, AHAM Verifide, California ARB and Energy Star certified. 3 Year Warranty