Humanely keep pesky animals out of your yard without poisons or traps. Sonar Barrier with Ultrasonic high frequency, (silent to most humans) irritate & annoy common yard pests, making them to seek calmer, untreated areas. Repels dogs, cats, raccoons, skunks, squirrels, bats, rats, mice, field mice, deer, bears and some insects. Easy to operate – can be set to either constant or motion-activated. Water & weather resistant, protects up to 1300 m (4000 sq ft). Comes with power cord or uses 4 x “C” Batteries. Sound frequency: 10KHz (adjustable.