I was quite a while looking for a useful way to connect an external music source to my 10 year old Clarion radio. Conversion to Aux-In is not an adapter and how it exists for other radios for connection to di changer control, is also unavailable for Clarion. So there was the Nuer alternative of an FM transmitter. At first I was only not so excited because I had already risen before 2 years a. After talking to a car audio specialist I decided me again to look for a. Wenns would not work, he goes back up. The Fahmann had told me that I should prefer to invest a few euros more, then these things work well. So I went on a search for a FM transmitter from 20 euros. The device previously was a cheap model and I can NOT recommend. Lousy Übertragungsqulität, fummeliges adjust the frequency etc. On the contrary, the MusicFly SD. That part works great. The Klangqulität is neat and thanks the scan funtion is the frequency Find easy. The issue is automatic. The MusicFly seeks a clear frequency and selects on the radio at the same. Very nice is also that the ID3 data is transmitted, as you know always what is played ;-) Although it takes a while before the information's will appear on the display, but it works well. The pity is that the MF always the last played song starts all over again when you turn off the power. All in all a highly recommended device that is easy to use and a good Übertragungsqulaität offers.