I use the same as BBBB:
http://store.apple.com/us/product/TN549LL/A?fnode=MTY1NDA2MQ&mco=MzA5NTk3Ng

Mine is made by Sony though.
It works great. I don't have to do the volume thing on my car.
It's easy and doesn't cost much.
Good lunck
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer