Has anyone used the Sena SM10 transmitter to transmit from a Zumo 665 to two Sena SMH10 Bluetooth headsets? I have the headsets but failed to realize that the zumo will only broadcast xm radio to one headset at a time. I was just wondering to what cables I would need with transmitter.

 

Not sure about the Zumo 6XX line, but I have a 550, and it has a 3.5mm output audio jack, which I plug into the SM10. The SM10 then Bluetooths to both sena headsets to play music.

There are a ton of answers on google (search: zumo 665 to sm10) for your question, this was the first result:

http://bmwsporttouring.com/ubbthread...&Number=796201