CatStop Automatic Outdoor Cat Repellent

Outdoor cat deterrent withmotion-activated burst of ultrasonic sound Protects your garden, plants or sandbox without chemicals or fences Cats are startled by sound (at a frequency most humans can't hear) and teaches them to stay away Monitors up to 280 square feet (26 square meters) Operates for up to 6 months on a single 9-volt battery.The 9-Volt AC adapter is sold separately