Cordless Ultrasonic Repeller deters animals 24 hours a day. Ultrasonic animal repeller uses high-frequency sound waves to keep deer, rodents, wasps, skunks, squirrels, and other pests out of your yard! Motion detector senses movement up to 15 feet away, then activates sound. Mounting hardware included. Uses six C batteries (not included). Plastic. 3 7/8" wide, x 7 1/2" wide x 2 1/4" deep.