Cardo Systems produce a unit that the wife and I use and like it very much. It's called a Scala Rider and is bluetooth. I use it in conjunction with my Zumo 550 (GPS) and mobile phone. Here is the url: http://cardowireless.com/scala_rider/ They make one that is the Team set and comes with two units one for you and one for your passenger. It fits on the outside of the helmet and has a great boom mike and speakers that work very well even on a half helment. Good unit and easy to switch from helmet to helmet. You will want to check to make certain that your phone and the units are compatible, you can do this I believe on the Cardo site. Good luck,
Kidcolt
