Most car dock connectors on the market today charge iPods/iPhones through a 12V connection that works through the FireWire portion of the 30-pin connector. Apple removed 12V (FireWire) charging from the iPhone(3G/3GS ; 4G/4GS), Touch (2G) & Nano (4G/5G); this means that older dock connectors are no longer able to deliver a charge. As such, these dock connectors will still perform their intended function, but fail to charge the iPod/iPhone. The 5ViCHA connects to the iPod dock cable you already have to provide 5V USB charging for all iPods including the nano(4G/5G), iPhone (3G/3GS ; 4G/4GS), touch(2G). * COMPATIBLE WITH FOLLOWING MODELS *: - iPod classic - iPod nano 4th generation - iPod nano 5th generation - iPod touch 2nd generation - iPhone 3G - iPhone 3G(S) - iPhone 4G - iPhone 4G(S)