Sena has been a leader in the Bluetooth industry since the inception of bluetooth. Their latest forays into communicators for motorcycle riders have been nothing but smash hits for Sena. The Sena SMH10 has been extremely popular since it was released, not only due to its excellent performance but also the convenience of the jog dial for easy operation on the go. The Sena 20S takes it to the next level by increasing the connection range and offering Bluetooth 4.0 connectivity. Sena is one of our most popular bluetooth communicator manufacturers.