Lavalier

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I mean, one of the miniature ones that you talk about, the Lavalier microphone.

Yes.

And how do they get their name?

Well, it derives from a type of necklace, which was a kind of very thin chain attached to a pendant or locket, which was apparently favored by the Duchesse de Lavalier, who was the mistress of Louis XIV.

So I think it's the idea of something obviously kind of something miniaturized and connected up by an inconspicuous array of wires or whatever.

So the levalliumite can be hidden in clothes or it can be hidden on the body.