An electric fence uses a wire buried underground around or inside the perimeter of the area you want your dog confined. The dog then wears a collar which acts as a receiver. When the dog comes to close to the boundary the collar will warn the dog with an audio signal. If they continue to come too close to the line the wire administers a safe and mild electric shock to dog, which is equivalent to a cramp or sharp back pain. The invisible fence system is a well known name which has been keeping dogs and cats safe at home by providing pet owners with trusted knowledge, proven training method and total coolness of mind.