HydroGuard: Outdoor Motion-Activated Pest Animal Repellent Sprinkler Works Day & Night To Instantly Repel Dogs, Cats, Raccoons, Birds, and More One HydroGuard Covers Approximately 1200-1300 Sq. Ft. Operates For Up To Six Months On A Single 9-Volt Battery (Can Activate Up To 5000 Times) Eco-Friendly, Humane, & Only Uses 2-3 Cups Of Water Per Blast Great For Gardens, Patios, Porches, Garbage Areas, Greenhouses