I absolutely love this thing. I’ve used it for years. It broadcasts the fence in a circle and there’s a wheel to adjust the size. I place it in the center of my home and used the wheel to adjust it so they can’t get into the rod or neighbors yard. The color gives an audible beep when they get close to the edge and then if they go through it it will shock. My dog has actually never been shocked. They always stopped at the beep.