Barrier Transmitter disguised as a rock blends seamlessly into your landscape * Quick and easy set-up and training * Lightweight, waterproof Receiver Collar fits pets with neck sizes 6 to 28 inches * Wireless option protects area up to 16 feet in diameter.Add a Dog or protect additional areas with the purchase of Pawz Away Receiver Collars and extra Outdoor Barriers * The customer needs to be sure the collar is turned to "on". When people adjust the the collar they must run a flame along the cut edge to keep it from fraying as stated in the instruction booklet.