The nozzles spray a very fine mist for 30 - 60 seconds that creates a blanket over the area to be protected.  Once the mist settles, effective coverage typically lasts for 3-4 hours.  The system is adjusted to spray at scheduled times  each night in order to eliminate mosquito populations within the perimeter.  The system also comes equipped with a remote control in order to activate the system at times outside of normal operating hours.