Get a pest deterrent and burglar alarm in one! The YardContro electronic yard fence helps keep outdoor spaces free from unwanted pests or trespassers by creating an undetectable, 360 radar zone covering an approximately 30 ft. (700 sq. ft.) area. Requires 4 D batteries (sold separately). When the built-in motion sensor detects an intrusion, it responds by emitting a high-frequency 120dB sound blast and flashing a powerful strobe light. A selector switch lets you choose how it responds. To fend off dogs, cats and other wild animals, use the ultrasonic mode, which emits an alarm that's bothersome to animals, but inaudible to humans. To scare away human trespassers or would-be thieves, use the standard mode that everyone can hear. The YardContro features weatherproof design for indoor or outdoor use, even in wet weather. Runs on 4 "D" batteries for up to 2,000 10-second sound releases (batteries sold separately). Includes brackets for easy mounting to walls, fences, trees or posts. Manufacturer's part number YC12.