Well, I would think that a flesh colored "ear-bud" would be less visible
than someone walking around with wires hanging out of their mouth!! :o)

How about a short range RF link from the a belt-worn voice radio to a tiny
RF hearing-aid-like device? Many modern hearing aids (while costing >$1000)
are invisible, except upon close inspection. It might be possible to gut the
amplification circuits and replace them with a single-chip RF receiver.

How about a baseball cap with a speaker in it, doing the same thing as the
mouth-ball idea (transferring the sound through the skull? I'm not sure that
the volume required to transmit the sound through the skull wouldn't result
in some noise emission as well, though. Hmmm... Difficult problem.

- Robert

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