Safety Tested: UL Certified & CARB Compliant 4 Filter Stages: Cold Catalyst, Activated Carbon, Antibacterial, & True HEPA Air Quality Sensor & Indicator: A particle and odor sensor monitors your air quality in real-time. Whisper-Quiet Sleep Mode: A whisper-quiet sleep mode and dimmable display makes it the perfect bedside companion. AUTO Mode: The fan speed will automatically adjust to meet your air quality needs, saving you energy costs and protecting you from what you can t see. Ionizer: A separately controlled ionizer can be turned on that releases negative ions, electrically charging particles and making them easier to trap. Remote Control: Controllable from up to 15 ft away with an included remote. Large Room Coverage: Replaces 100% of the air in a 700 sq ft room each and every hour.