Just using this forum to vent. I have a Sena 20S and use it for iPhone/Music/GPS. Wanted to hook up radar to the 20S. According to Sena.com, the SM10 is a timely and cost effective way to do this. I've spent hours trying to get it to work, even spent 45 minutes on the phone with Sena tech support. They finally told me sometimes it just doesn't work. I tried to switch it for the more expensive SR10. After 7 apologies, Sena finally told me they couldn't help me. So I'm stuck with a $100 paper weight.