The filter lifespan indicator will tell you when to change the Max2 Filter. Airmega gauges the lifespan of our filters based on usage, not time. The lifespan of the filters will be determined by indoor air quality and operation of the unit. The app gives you the ability to monitor the indoor air quality, see the status of the filters, schedule the timer, and even receive real-time outdoor air quality updates. The LED ring lets you know if your air is fresh or unhealthy every minute of the day. Auto: Smart Mode automatically adjusts the fan speed according to the room's current air quality. Eco: When the air quality remains good for 10 minutes or more, it conserves energy by shutting down the fan. If the air quality sensor detects pollution in the air, the fan will restart automatically. Sleep mode can be activated by manual, and the light sensor detects when it's dark and the air purifier automatically reduces its fan speed so it runs much quieter.