A couple of people asked me yesterday where I got my throat mic from, so here's the company:
http://soundrite.biz/The model I have is the Stryker, which is single pin connection, compatible with my Motorola FRS.
Given the price (which is about half what I've seen the Stryker listed for anywhere else), and the fact that they ship from Hong Kong, I have to believe these are knock-offs. Mine seems to work most of the time though, so I don't really have any complaints.