This is the best thing I have ever owned. The convenience of bluetooth for both listening and communications. Great for group bike rides where two guides are needed to keep the group together and communicating to the front what is happening in the rear of the ride. Great on both road and mountain bike rides. The access of a communicator like the cardo BK-1 is essential on all rides but most of all for long distance rides.
Thank you very much.
Jamie Spirit Evora (As posted on the cardo BK-1 facebook page)