HIOTECH Dock Extension Cable, 30-pin Male to Female Dock Extender Vedio & Audio Extension Connector for iPhone 4 4S 3GS 3G/iPod Touch/iPad/iPad 2 (Black/2PC) The Dock Extender Cable allows you to dock your iPod or iPhone from a distance or while in a case Support data transfer on iPod/iPhone. Support audio/video transfer on iPhone 17 Core version Support Audio Video Signal, Sync Charger for Apple Easily extend the connection between your iPod or iPhone with docking station. High speed data transfer and sync, audio/video transfer on iphone/ipod/ipad. Small Diameter, Flexible Cable. 30-pin Male to 30-pin Female.