Our exclusive Quick-reaction Perimeter Intrusion Detection system (QUPID) is a new, low cost, intrusion detection and tracking sensor that monitors the area beyond a fence line to extend the perimeter defenses. With a range of selection of between 30 meters to 100 meters and beyond, the system provides early warning of an intrusion before they actually occur. QUPID can detect vehicles and intruders on foot, even someone crawling on the ground.