Optimized purification function effectively detects and reduces bacteria and viruses, such as H1N1 (influenza), for cleaner air and a healthier home. A professional-grade sensor with AeraSense technology accurately detects and quickly respond to even the slightest particle change in the air, providing reassurance with real-time PM2.5 feedback.AeraSense technology detects your indoor air allergens and displays the potential risk level of the air allergens on a scale from 1 to 12. Using the Air Matters app you can control your air purifier anywhere, anytime. Check the air quality in the app to get reassurance wherever you are, and to compare your indoor air quality with the outdoor air quality. You can also use the app to change the fan speed and to check the filter status.This product has 3 automatic purification settings: General mode, extra-sensitive Allergen mode, and Sleep mode. In Sleep mode, display lights are dimmed and the fan switches to its lowest speed.