Very different use case. Those have a transducer (speaker) inside the plug. What you'd actually need to do what they want is active threshold-trigger, or perhap

Very different use case. Those have a transducer (speaker) inside the plug. What you'd actually need to do what they want is active threshold-trigger, or perhaps just really good ANC. Edit: Also the difference between $200+ custom molds and plugs, vs foam ones that need to cost a few cents each.