Keep nuisance animals away with the Bird-X Yard Gard Ultrasonic Animal Repeller. This maintenance-free ultrasonic device is effective against many pest mammals and can be triggered by an energy-saving motion sensor or set to work continuously. Use it to repel dogs, cats, deer, raccoons, skunks, opossums, rodents and bats without snares or toxins. Covers up to 4,000 square feet. AC cord included.