So, every once in a while when I watch Stargate: SG-1 (or, more often when I watch Atlantis), I wonder how the little earpieces they have work/if they actually exist out here in the real world. Considering the show is pretty good at realism, I'm thinking they do exist.
My two biggest questions: 1) How do the earpieces turn on and off? and 2) Is there any privacy setting? Can one person talk to another person without everyone hearing?