The SportDOG Brand® In-Ground Fence System is a simple and cost-effective alternative to a traditional fence. Safe and effective for all dogs over 10 pounds, the SportDOG Brand® In-Ground Fence System's transmitter is 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. Your dog wears a correction collar that receives a signal from the wire and warns him if he ventures too close to the perimeter. The waterproof collar receiver allows for four adjustable levels of correction plus tone and vibration mode. The system is expandable to include any number of dogs with the purchase of additional collar receivers. Follow the training instructions included with your SportDOG Brand® In-Ground Fence System to get your dog acquainted with his new boundaries and he will be staying safely in your yard in no time!