The sensor sends a radio signal, up to 500 feet away, to the Driveway Monitor alarm receiver in the home that lets you know that a vehicle has arrived. Receiver chimes and flashes when a vehicle drives past the sensor in your driveway. Place the receiver in your kitchen, bedroom, or next to your favorite chair. The receiver will chime and the green LED light will flash constantly to alert you that a vehicle is approaching. Small, rugged, weatherproof sensor provides years of reliable service.
Extra sensors are available to monitor more than one area.
Available for viewing and purchasing, this is a must see. This is a useful wireless detection system made with the camper in mind. Alert System A wireless detection system geared for homes and yards, this one is packed with convenient features. No batteries, No Electricity Convenience at its best, easy to set up and use door announcer. DA 50 Infrared Door Entrance Chime - For Open Doors Infrared technology, at a great deal.