When I was first learning to ride we had chatterboxes that attached to the helmet. They work great - I think up to a mile separation and I could still hear my husband screaming at me askin where the heck I was and what the heck did I think I was doing. I hated that. But when I wanted to let him know that I wanted a break, it was good. They were a little heavy, made you ride with a tilt to your head. I guess this is about six year old info, so I am sure there are much better and innovative way of communicating now.
Now we rely on the ole hand signals - Out of gas, Kiss my Butt, Bite Me, Love you, Thumbs Up
, Thumbs Down, Up Yours, #1
you know the ones.
If I could ever do something over again, I'd forget about the need to communciate with words while riding. Just not all that important. I'd love it if it were part of the bike, but strapping on extra stuff, it is just too easy to pull up beside someone and ask them to pull over for a sec.