Driveway Parking Patrol Sensor and Receiver Kit - Wireless up to 400ft -by Unique Imports Exclusive from Unique Imports - Sends alert when people, vehicles enter driveway or approach mailbox Wireless; motion-activated; weather-resistant; 400-foot range Sensor installs with screw on any surface: door, post, garage Portable receiver has three settings: high or low chimes and off Operates on one 9-volt and three C-cell batteries (which are not included)