Wireless Driveway Patrol™

This high-tech, easy-to-use security system features a wireless motiondetector that alerts you when someone approaches your home. Simplyplace the transmitter along your driveway, up to 400 feet away from yourhouse, and whenever a vehicle or person passes by the sensor, thereceiver will alert you with an audible tone. Never miss a delivery orunexpected guest again while using this driveway alarm! Uses one 9-volt and 3 C batteries (not included).