Where can I find a communication device so I can talk to my wife when we are both riding and one of us gets ahead fo the other? Or if the wind os blowing to hard for us to hear each other. I know they have them for motorcycle riders and they are "worn" under the helmet. I also think I saw something similar while watching the TDF. So where can these commuication devices be purchased? And what are they called? Brand name, etc? Is there a website link?