Sonic wave movement detector

In Move - And You're Dead, Alan and Grandma Tracy are trapped high on the girders of a recently completed suspension bridge over the San Miguel River. A sonic wave generator is positioned nearby. If either of them makes any move, the sonic wave device will register the movement and detonate a bomb attached to the underside of the bridge.

In the end, the generator was neutralized by Brains using the Neutralizer Tractor.

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