You choose the configuration to not only keep your dog safely at home, but also clear of out-of-bounds areas such as gardens and pools. Your dog hears a tone as he approaches the border; feels a static stimulation if he continues into it. Patented run-through prevention offers secure, reliable containment. A radio signal travels from the Fence Transmitter through a buried wire, marking the boundaries you wish to set for your dog. Your dog wears a Receiver Collar that detects the signal at the boundary. As your dog approaches the boundary, the receiver issues a warning tone. If he proceeds further, he receives a safe but startling static stimulation. While harmless, the stimulation will persuade him to stay in the containment area you've established. Boundary flags are a temporary visual aid for your pet; remove them after training. This Innotek system has been proven safe, comfortable and effective for pets over 3.6 kg.