The SM10 is a dual stream Bluetooth stereo transmitter that allows motorcycle riders to connect audio devices such as mobile phones or MP3 players so that both the rider and passenger may listen to the same source at the same time. It also supports onboard audio systems of specific brands by using optional audio cables. The SM10 has an aux audio input that enables the rider to connect additional non-Bluetooth audio devices such as a radar/laser detector or a GPS navigator. It comes with a holder so the unit can be attached to handlebars, or can be placed in a rider’s pocket. It retails for $149.