Keep your dog safely in your yard with the SportDOG Brand In-Ground Fence System. A simple and cost-effective alternative to a traditional fence. Safe and effective for all dogs over 10 pounds, yet powerful enough to cover up to 100 acres of land. Installation is as simple as burying the wire around the perimeter of your yard and plugging in the transmitter. The dog's waterproof correction collar receives a signal from the wire and warns him if he gets too close to the perimeter. Expandable to include any number of dogs with the purchase of additional receiver collars. Four adjustable levels of correction plus tone and vibration mode.