RIDDEX® SONIC REPELLER keeps unwanted birds (and their mess) off your porch, patio, deck or lawn! Motion-activated device emits a powerful, ultrasonic tone that causes birds to flee. It’s an effective, humane way to banish pests and prevent damage around your home’s exterior. Just set the dials and the repeller does the rest! Weather­proof unit mounts anywhere with keyhole slots. Uses included AC adapter with 58" L cord, or 6 AA batteries (not incl.). 5-5/8" H x 4-1/4" W x 3" D.