Outdoor In-Ground/Underground Wire Radio Dog Fence Containment Systems - Have fun with your pet throughout your Pet training process. With Outdoor Underground Wire Radio Dog Fence Containment Systems, make the dog training a fun, fair, firm and consistent event.  Outdoor Underground Wire Radio Dog Fence Containment System works by producing a radio signal from the Fence Transmitter through a Boundary Wire.  In-Ground Radio Fence has been proven safe, comfortable, and effective for all pets.