Trusted and true, our original Wireless Pet Containment System keeps pets happier while you breathe easier. A simple signal from a small unit in your home to your dogs collar is all it takes. They learn their new yard boundaries quickly and comfortably, and the collar will remind them with a tone or static correction if they forget. Before you know it, its all happy playing and no random straying. Covering an area up to « acre, its portable, requires no buried wires, and sets up in 1-2 hours.