Cordless ultrasonic repeller deters animals 24 hours a day. Uses high-frequency sound waves to keep deer, rodents, wasps, skunks, squirrels, and other pests out of your yard! Motion-activated animal repeller senses movement up to 15' away, then activates sound. Mounting hardware included. Uses 6 C batteries (not included). Plastic. 3 7/8" long x 7 1/2" wide x 2 1/4" deep.