Place the Outdoor Pet Barrier in any area you want your pet to avoid. No more getting into the trash, jumping in pools or ponds or digging in flower beds: How It Works. The Barrier Transmitter, disguised as a rock in your landscape, sends a circular radio signal to your pet's Receiver Collar. When your pet enters the Barrier Area, he'll hear audible tones from the Receiver Collar followed by a safe, progressive Static Correction. The correction is delivered through the Contact Points of the collar that touch his neck. He'll quickly associate the correction with the area you've declared off-limits: Wireless Option. Quick and easy set-up: just place the rock and set the range, covers up to 16 feet in diameter: Wire Option. Create a custom shaped barrier using up to 150 feet of wire (sold separately). See swingset illustration: Features. Barrier Transmitter disguised as a rock blends seamlessly into your landscape. Quick and easy wireless option protects area up to 16 feet in diameter. Create a custom shaped barrier using up to 150 feet of boundary wire (sold separately). System Includes. Waterproof Barrier Transmitter (4 Alkaline D batteries required, not included).