iPod / iPhone / iPad 12V to 5V Charging Adapter - Converts Old iPod Dock, iPod Alpine, Pioneer and Car Hook Ups to 5V Allowing You to Charge Correctly (Lifetime Warranty, Bulk Packaging)
This has worked great and I'm so glad that I got it. My car stereo can now play AND change my iPod compared to just playing and not charging. It was totally worth it.