As my own car radio has an AUX input, I bought this item for the times when I might want mp3 sound in a different car. So far, I have used the item only once, but it was a disappointment. We were driving an older Audi Quattro with a respectable sound system. We were out in a rural area away from big cities so there were some gaps in the frequency band. We tried many different frequencies but were unable to find a setting that would work without distortion. Luckily we had some decent CDs with us. My purchase was motivated mainly by the lower price. I regret I made a poor choice.