The Hydroblast Scarecrow animal repeller senses animals through movement and heat. When an animal is seen, a valve opens, instantly releasing a three-second pulsating spray of water. The combination of the sudden noise, movement and water frightens animals away. This startling, yet harmless action is a remarkably effective deterrent. Hydroblast Scarecrow activates up to 5,000 times on one 9V battery using a garden hose. Repels dogs, cats, deer, raccoons, squirrels, rabbits, skunks, woodchucks and other garden pests. Ideal for use in gardens, patios, porches, greenhouses, and more.