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Shockingly, if that market exists, it doesnt advertise itself. Otherwise they’d be making bank off the DoD and anybody else with restricted device policies.
Its not exactly a complicated device to produce afaik, either;
- internal storage
- no recording capability (camera/microphone)
- no wireless capability (no antenna whatsoever)
- analog audio output
- bonus points for a non-data-carrying charging port (aka, barrel power connector, not USB) so you can charge it in a SCIF (USB cables not permitted).
I do have a ring i could drop in a volcano… (/s)