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Perimeter security background, various forms of perimeter security, electrified perimeter security array monitors, how they all use the ancient, antiquated patent #4,220,949 and why the Fence Hawk is different - because it measures the actual voltage of each pulse from the fence energizer, and makes a computerized decision as to whether or not spurious signals are an intruder or natural events like lighting, squirrels, etc. In 10 years nobody has defeated a Fence Hawk Perimeter Security System. This video shows why.