The Blue Pure 411 Auto air purifier takes a simple approach to air quality management with an integrated particle sensor， Auto mode setting， and LED air quality display. Independently evaluated for performance by the AHAM Verified Program for a Clean Air Delivery Rate (CADR) of 123 for fine smoke particles， 96 for pollen particles， and 107 for dust particles. Best for small rooms like nurseries， guest bedrooms， and home offices with a 360° air intake to filter room air about every 12-minutes (about 5x an hour at 190 sq. ft.) on high. The 3-step filter works with HEPASilent filtration technology to remove 99.97% of airborne particles down to 0.1 microns， like pollen， dander， mold， bacteria， viruses and more， while a layer of activated coconut carbon traps light household odors. Features a 3-color LED air quality display and one-touch enabled Auto mode setting to auto-adjust to real-time conditions. ENERGY STAR rated using less energy than an LED lightbulb (2-Watt – 10-Watt) and quieter than a whisper on low (18 dB – 48 dB). Change color with five fabric pre-filters inspired by Scandinavian nature. Pre-filter in Arctic Trail (gray) included Additional colors sold separately. All Blueair purifiers are AHAM Verified for Clean Air Delivery Rate and recommended room size， ENERGY STAR rated， and tested by the California EPA Air Resources Board (CARB) for safe ozone emissions.