Dont worry any more about unsightly droppings of animals on or in front of your property as soon as the pir detector of our animal repeller registers movement in the monitored area it emits a sound inaudible to the human ear animals however find the ultrasonic sound unpleasant animals are not harmed device field proven over many years secure and reliable effect extra large sensor with wall mount ground spike and universal mounting bracket adjustable in 4 directions technic