Trusted and true, PetSafe's original Wireless Pet Containment System keeps pets happier while you breathe easier. A simple signal from a small unit in your home to your dog’s 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, it’s all happy playing and no random straying. Covering an area up to ½ acre, it’s portable, requires no buried wires, and sets up in 1-2 hours.