OK then you might be interested in the GOgroove FlexSMART X2 instead. It pairs to your iPhone via bluetooth , then broadcasts an FM signal that you play on your car stereo. The device also acts as a hands free device to allow you to make/receive phone calls which you'll hear through your car stereo speakers.
It's a great little device and being that it plugs into your cigarette lighter makes it easy to move from one car to another. I bought it online at walmart , but it is available from other vendors.