I researched and found the Blueant Interphone system. I first bought one because I am on call 24/7 for my job. I needed something that I could answer my cell with no hands. My idea was if the situation was urgent I could pull over and if not urgent I could talk and be done with it. It has worked perfectly for that purpose. My wife got the bug and bought a bike. I got a second Blueant Interphone and pared them. It's bluetooth so no wires to deal with. We can talk / coach in full duplex, no push to talk. One button to put in standby when we have nothing to say. They last a full day of riding and we have used them about a mile apart. They claim a much shorter distance. When riding together you are not that far apart usually. They reconnect when back in range if you do get separated. We have been using them for a year now trouble free. They run about $125 each and work in full or open face helmets. The noise reduction is fantastic. blueant.com.au/interphone_helmet_kit.htm here is a link the site for more info. Several internet sites sell them from $125 to $170 or so.