Underground Control Dog and Cat Fencing SystemThe closer your dog gets to the buried boundary wire, the more intense the shock will become. A warning sound will be issued first, then a shock stimulus after 410 seconds. If your dog continues to move closer to the boundary, the shock stimulus will intensify. The system allows you to precisely control the width of the signal field. Should your buried wire ever break, a loud sonic alarm will sound accompanied by a flashing light. The faster your dog