How It Works:Using infrared technology, this repeller senses an animal's heat and movement up to 30 feet away. When an animal is detected, its sprinkler releases a sudden burst of water combined with startling noise and motion that safely and effectively repels a wide range of animals. And the animal detector works day or night, so it's always on watch. This motion sensor sprinkler will defend up to 1,900 square feet.This repeller eliminates the need to apply chemical repellents, keeping your yard easy and inexpensive to maintain, and safe for children and pets. And each spray uses only 2-3 cups of water, so it's efficient.Features:>4 XAA 1.5V Alkaline batteryneeded(not included)>Protect your ponds, lawns, flowerbeds and plants from destructive animals,driving small animal out of the garden gently.>This repeller senses an animal's heat and movement up to 35 feet away.>Low water consumotion>100% HUMANE & SAFE FOR YOU AND YOUR PETS>Easy set up and adjustable