I can't answer your question but I can state how unhappy I am with the Sena 10 system. I bought it for the matching Bell helmets for my wife and myself primarily as an intercom while riding. Not only was the wind noise so loud that we could barely communicate, but on the second day I was using it the system failed in one of the helmets. Unfortunately I had not saved the packaging materials since I thought everything was working fine so I can't return this useless set. I guess I will work on it and see if I can find and fix the problem, but right now I think I just wasted $300+.