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Tone Generating Earplugs

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For those times when a -20db foam plug just doesn't quite cut it: Tone generating earplugs. They'd play a variety of tones and volumes and prevent even the loudest kid on the airplane from invading one's space. I imagine they would look much like a foam earplug (foam outer cover to be replaceable) and that you'd grasp it and twist it to turn it on.

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