HBetterTech Dock Extender 30pin Extension Adapter Cable for Apple iPad2 iPhone 4 3G iPod -Black 30 Pin Male to Female Dock Extender for iPad, iPhone & iPod. dock without remove case Provides a compact extension, fits all protective cases covers, or skin (except Apple's iPhone 4 bumper case and lifeproof case). Allows devices to dock with dock cable accessories Support charge,Sync and play music