The Premier Pet Wire and Flag Expansion Set allows you to expand your current Premier Pet In-Ground Fence system. With an extra 500 feet of wire, 50 boundary flags, two splice capsules and two wire nuts, you will be able to expand your containment system to cover up to one acre, when added to the wire and flags already included with your fence system. Adding two expansion sets will allow you to expand your containment area up to two acres, and adding three sets will expand your containment area up to the 5 acre maximum.