Basic In-Ground Fence keeps your pet safely contained in your yard. Install the system by burying the boundary wire in your yard and setting up the transmitter. Mark the boundary with the provided flags and then you can begin to train your dog. Most dogs learn their new boundaries in as little as two weeks. If your pet gets too close to the yard edge, the waterproof receiver collar reminds your pet with a warning beep, followed by a safe, static correction if he continues. Add an unlimited number of pets by purchasing an extra collar for each pet.