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A pinch is a device which creates, like, a cardiac arrest for any broadband electrical circuitry. Better yet, a pinch is a bomb - now, but without the bomb. See, when a nuclear weapon detonates, it unleashes an electromagnetic pulse which shuts down any power source within its blast radius. Now that tends not to matter in most cases, because the nuclear weapon usually destroys anything you might need power for anyway. But see, a pinch creates a similar electromagnetic pulse, but without the fuss of mass destruction and death. So instead of Hiroshima, you'd be getting the seventeenth century.