The Mighty Mule Wireless Driveway Alarm monitors and alerts you when someone enters your driveway or property entrance. The easy to install Wireless Driveway Alarm uses a reliable electromagnetic vehicle detection system that senses only mass metals is motion passing through your driveway or property entrance. When a vehicle has passed through the Wireless Driveway Alarm you are notified by a chime on the include indoor base station. This system features a wireless range of 400 ft. and with our electromagnetic technology will only detect cars, truck, UTV's or tractors avoiding any false alarms notifications.