I simply got completed with a 400 mile journey weekend with my spouse on our bikes with one of these headphones and I am happy together. Sena SMH10D-01B SMH10 installed easily into our full face headgear, we figured them out quick, and the standard was great. We used all of them with our Audio players jacked in, whenever we wanted to speak to one another, each one people could hit the large talk button and also the models would give up the background music and get into intercom mode. We’d a five hour day about the bikes and also the batteries held strong the whole time. The only real problems were they acquired lots of wind noise at highway speeds, the helmet loudspeakers were just a little tinny, and when I did not have my helmet sitting perfect, the left speaker would rub my ear. These problems were minor and workable. Also, the number was great. It states that they’ll transmit up to and including half mile approximately. We did not have that far apart however I know I was a minimum of single Or 4 mile apart sometimes without any issues. The battery chargers are great too. It’s nice they charge over USB which a wall plug to USB energy adapter is incorporated, that is available in handy when you wish to charge every other USB products just like a mobile phone or music player. I’ve not used the bluetooth features yet but syncing the Sena SMH10D-01B SMH10 headphones was super easy. Great headphones. I highly recommend Sena SMH10D-01B SMH10.