The Outdoor Animal Repeller works on a variety of pest, including raccoons, rodents, armadillos, bats, cats, dogs, and deer. It can also keep farm animals such as cows, from wandering and feeding in areas where they are not wanted. The POR motion sensor can view uo to 110 degrees with a radius of 25-30 feet (7-9 meters). Sound frequency ranges from 21kzh-45khz.The Outdoor Animal Repeller is ultrasonic and cannot be heard by humans. Unit operates on four AA Batteries (not included) and covers 30 foot radius.Great for keeping animals out of:GardensTrash CansNesting areasFlower BedsGaragesAtticsCellarsBasementsStorage ShedsAnywhere pests are defacing property and more!