Air Quality Monitor: Coded monitor keeps track of the air quality in your room and will automatically adjust the fan speed if operated in auto mode. Filter Replacement Indicators: The electronic display alerts you when it is time to check the filters. In addition, the Max v-hepa filter also has a color coded guide so you can see visually when …
https://www.amazon.com/Oransi-Large-Purifier-Asthma-Allergies/dp/B004ZL8URK