a blend of wit and charm
Join Date: Mar 2005
Bikes: Serotta Fierte and a 1989 Centurian Prestige (plus, various others)
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It's called a Throat Microphone, or a Transdermal Neck Microphone, although calling it the latter is usually for speech loss applications. It picks up vibrations of the vocal-cords through the neck muscle and skin. It cuts out backgound noise that a regular mic would pick up.
Soldiers and motorcycle riders use them.