[BC] Is That a Radio Station In Your Pocket, Or...

[Jeff Carter]

On Thu, Nov 21, 2013 at 4:08 PM, Thomas G. Osenkowsky
<tosenkowsky at prodigy.net> wrote:
> I remember hearing this story decades ago...

> A passive microphone that never need batteries, etc. and will not show up on
> an RF sweeper.

It was nothing short of genius.  Nothing active in it whatsoever, and
it worked like a charm for a very long time.

http://en.wikipedia.org/wiki/Thing_(listening_device)