Repels dogs, cats, deer, raccoons, skunks, armadillos, rodents, bats and other creatures. Humane, effective, maintenance-free electronic yard protector keeps animals away from your property without messy or expensive chemical solutions. The Electronic Pest Repeller is ideal for yards, gardens, porches, buildings, greenhouses and more. It can be mounted anywhere. The yard guard covers up to 4000 square feet and can work continuous or motion-sensor operation. A built-in infrared motion sensor activates when pests move into its coverage zone. It has an adjustable frequency and a powerful sonic and ultrasonic sound depending on the pest. It has a weatherproof snap-on rain-cover which protects the controls and it operates of either AC power or batteries.