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If you're looking for one here's a good place to start:neww:Valky-talky for divers?! Is it exist?! Sombody wonts to talk about?!
3dent:I remember seeing one in a LDS a few years ago that didn't require a FFM. It had a rubber cup that went between your mouth and the reg. I thought it was a BuddyPhone, but couldn't find it on their site. Don't have any idea how well it worked...
WarmWaterDiver:I'm not sure what you're looking for - these use wireless ultrasonic between units, bone conduction, and do not have a cable between units.
http://www.divelink.net/halfface.htm
http://www.divelink.net/techspecs.htm