Radio Fences

The signal is transmitted through a wire placed along an antenna that carries the signal. The pet is trained to know it's boundary. The receiver, attached to your dog's collar, provides a warning beep if he approaches the wire. If he starts to cross the wire, he will receive a mild correction. Although harmless, this will dissuade him from continuing further. This covers 1500m boundary and comes with one collar although with purchasing more collars any number of pets can be contained in this way.