The transmitter constantly sends a radio signal through the perimeter wire. The wire is merely the transmitting aerial for the radio signal. There is no electric shock if this wire is touched or accidentally cut while gardening. The transmitter warns you if the boundary wire breaks, generally when workmen or the gardener dig in the wire’s path. Battery back up is available for the larger transmitters in case the mains power fails. Lightning protection circuits save your transmitter from storm damage. Indoor transmitters can also be supplied to protect valuable furniture, a home office, or a baby’s room from the dog.
The boundary wire loop is run around the perimeter of the area where the pet is confined. The wire can be placed on the ground under a hedge or fence. The wire does not have to be buried, but it should be kept taut across driveways with bricks on either side of the drive so people do not trip over it. Car tyres do it no harm. It must be a complete circuit, beginning and ending at the transmitter. If desired, additional loops can be run inside the garden around pools and flowerbeds to keep your pets out of them. The wire is stranded copper, coated with black insulation and is about as thick as a strand of spaghetti. For larger loops slightly thicker polyethylene coated wire is used as this has better weathering and electrical properties.
When the pet comes within two to three metres of the wire - the exact distance is pre-set by turning a knob on the transmitter - the receiver attached to its collar picks up the radio signal and turns on a chattering noise which warns the pet to go back. If the pet disregards the noise and does not move back in just under one second, it receives a series of mild electric shocks, rather similar to the shocks sometimes experienced after walking across a nylon carpet in dry weather. This stimulates the pet's neck muscle involuntarily and, in short, frightens the pet. It has been tested and proved harmless, both physiologically and psychologically, in an independent university study. The pet will continue to get this 'correction' until it backs away from the signal zone of the wire.