The Contech StayAway Motion-Activated Automatic Pet Deterrent protects your porch, patio, potted plants, and countertops. Just place it in the area you want to protect, and the StayAway does the rest. When a cat approaches the area, the StayAway responds with a warning sound and a brief spray of "compressed air" to warn your pet away. Once your cat learns to recognize the warning sound, you can switch to the "sound only" mode to conserve compressed air for an even more economical solution. Features: Detects motion up to three feet (one meter) away. Combines sound with "compressed air" for an odorless deterrent. Operates up to 200 times on a single, replaceable canister of "compressed air". The motion sensor and spray are separately adjustable so they can be positioned precisely.