A transmitter plugs into a standard outlet and emits a radio signal that travels along an underground wire. (The wire only needs to be buried an inch or two to prevent anyone from accidentally cutting or tripping over it.) The lightweight receiver worn on your pet's collar (or you can use the free collar that comes in your kit), picks up the radio signal and alerts him as he nears the underground boundary that you have customized for your yard. If he crosses the boundary, he will receive a mild correction, similar to a static shock.

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