General Spec Color black Plug & Interface 1 × Mini USB,  1 × Customized USB    Function offer 400mbs throughput for quick transfer of your music and data to iPod and iPhone 4G Compatibility iPod and iPhone 4G Others retactable USB cable Features Update your iPod and iPhone 4G at high speed with the latest music and data. The iPod dock connector to USB retractable cable offers 400mbs throughput for quick transfer of your music and data to iPod and iPhone 4G. The innovative retractable design cuts down on travel bulk and ensures the portability of your MP3 player without sacrificing functionality. No more tangled cable mess.