The black 30-pin Dock Connector to 3.5mm Stereo Mini Plug Cable - 20" from Comprehensive Cables allows you to connect portable audio equipment to the line-out of your Apple devices. The cable features a 30-pin Apple dock connector on one end and a gold-plated 3.5mm stereo mini plug on the other end. The 30-pin connector comes with a handy removable cap that can be placed over the connector when you're not using the cable, to keep out dust and debris.
Removable Dust Cap
Comprehensive 30-pin Dock Connector to 3.5mm Stereo Mini Plug Cable - 20" (Black)