Protect your property with this humane, effective, electronic yard protector. Keeps animals away without messy or expensive chemical solutions. A built-in infrared motion sensor activates when pests move into its coverage zone, causing the unit to emit a powerful and adjustable sonic and ultrasonic sound not audible to humans, but highly alarming to animals. Use it to repel dogs, cats, deer, raccoons, skunks, opossums, bats, rodents and other creatures. Keyhold slots let you mount it anywhere. Operates on either 4 c-size batteries (not included) or a 120vAC adapter (included). Covers up to 4000 square feet and costs less that 25 cents a month to operate. A snap-on raincover protects the controls. Ideal for yards, gardens and more. Unit measures 6.75"x5.25"x3.5".