Really, there are electronic ear muffs and electronic ear muffs. I've had a few, the gold standard usually come down to two brands in most peoples opinions once they've tried everything. There's Sordin and Peltor, now owned by MSA and 3M respectively.
One of the reasons that these two brands get the reputation is in sealing and longevity of the electronics for corrosion, and audio performance of the noise cancelling and internal microphone/speaker circuits. Not to say anything negative about the GC brand above - as I haven't had any experience of them at all but I would be expecting they would be similar to the other products in the price range I've tried. My current sets of Peltor gear include a Tactical Pro set which is rated Grade 5 for industry, several sets of listen-only Peltors for hard connecting to radios and a couple of sets of two-way comms earmuffs. My latest is a full two-way comms headset with built in UHF 433MHz radio and external ambient sound - two way radio is useless for me with the frequency but the rest of it's features are great. With the ambient listening set to '1' it's normal conversation, on '6' I can hear a cricket fart at 100m (I'm not kidding...). But retail for that is circa $2K for the latest version with bluetooth, not that I paid anywhere near that!
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