The Belkin Retractable Car-Stereo Cable for iPod and iPhone connects your compatible iPod or iPhone to your car or home stereo, portable speakers, or sound card for headphones-free listening. It can also be used with other audio devices that feature a mini-stereo jack.
Just pull the 4 foot, 9 inch cable from both ends to the length you need. Connect the cable on one end to your iPod or other audio device and on the other end to your car stereo, home stereo, portable speakers, or sound card. When you're done let the cable retract back into its holder.