A close-fitting choker with embedded subvocal microphones that pick up throat vibrations from speech too quiet to be audible. The wearer can communicate through mouthing words or whispering at volumes inaudible to anyone standing next to them. From the outside, the choker looks like a simple black band necklace.

Essential equipment for covert operations, undercover work, and the kind of negotiations where being seen talking to your handler would end the conversation — and possibly the speaker.