As far as operation goes, the unit has four modes: Manual, Sleep, Eco, and Smart. The latter automatically adjusts the fan speed according to the room's current air quality without any direct input from you. Eco mode is more or less a sub-mode, and engages automatically while in Smart. If the air quality sensor registers clean air for 10 minutes, the Airmega will stop the fan and enter Eco mode, reactivating it only if the air quality goes down again. When in Sleep Mode the Airmega monitors whether the room it's in is dark and if the air quality is clean. If the latter two conditions are met, it turns off the fan and the insanely bright LED indicator lights.