It's a 1977 ad, but yes, the shape of those plugs is good. I understand they let higher frequency noises through so you can hear leaves rustling and so the world does not sound muffled. That makes sense as there is a clear air passage through the peripheral holes in the silicone diaphragm.
My question is, will they really shut down quickly enough, at a sudden loud sound like a shot? No batteries is appealing but not at a cost of my hearing. Has anyone out there ever tried this kind of ear plug? .
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