From a Google search inspired by an idea I got reading Scott Berkun’s Why panel sessions suck (and how to fix them):
Why has no-one commercialized this? It’s the obvious solution to the “pass the microphone” problem at panels, talks and other audience-participation events.
> Why has no-one commercialized [a foam wireless mic
> that looks like nothing so much as a doggy chew toy]?
Perhaps because it’s obviously goofy.
Not conceptually, I mean, but visually.