Be warned when a car drives up! When an auto drives onto your property you will know it, thanks to the Probe w/10-Foot Cable. The magnetic sensing method used by this vehicle-alert system is immune to false alarms by animals, swaying trees and people. The sensor probe is simply buried 6 to 8 inches underground beside your driveway. Run its 10-foot cable to a wireless transmitter or add extension cable (up to 2500 feet) to a console in your house. The Vehicle Sensor Console will buzz for an adjustable duration and can also activate two relay outputs.