This underground electric fence is one of the most reliable, cost-effective pet containment systems available today. Easy-to-install, rechargeable, IP 4 waterproof and 5 levels correction of the underground electric fence collar is suitable and easy for any size dog. A buried wire transmits a harmless radio signal. When your dog approaches the boundary, the signal causes the dog's collar receiver to deliver correction what you set. This underground electric fence will help you train your dog to stay within the boundary area where you are allowed.