AeraSmart™ Sensor monitors the air quality and automatically adjusts the fan speed to keep your air purified. True HEPA filter with AeraSafe™ antimicrobial treatment safely removes 99.97% of airborne particles as small as 0.3 microns, including pollen, ragweed and other allergens, viruses, germs, dust mites, mold spores and cigarette smoke. Ultra quiet operation. Filter Change Indicators let you know when it is time to replace your Carbon or True HEPA filter AM IV PC. PureView shows the status of the current room air quality including percentage of particles captured and removed from the air. Cleans air 600 to 1400 square feet. Display Screen shows PM 2.5 and PM 10 air quality – making the invisible, visible. EnviroSmart ™ 2.0 includes dual self-regulating laser particle counters, VOC, audio and motion sensors. VOC/odour level display. Filter replacement, life & reorder information. Brightness adjustment, standby and off. 5 year limited warranty.