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Invisible Fence® Brand and other pet containment systems use twisted wire to carry a neutral signal from the transmitter to the perimeter boundary antenna.
The twisted wire does not transmit any signal to your dog's Computer Collar® - so your pet can safely play in any area where the twisted wire runs.
This roll of 100 feet is is used for longer run applications, and is also available in a 50 ft. spool.
If you need to repair existing twisted wire in your Invisible Fence® Brand or other pet containment system, a Wire Splice Repair Kit is also useful. You will typically need 2 repair kits to splice a break in twisted wire.