3.5mm Aux Cable Retractable Black [Electronics]
My car is way less cluttery now that I can retract this away.  I love how this wire expands and retracts so consistently (still hasn't broken after 6 months).  I was skeptical about the small guage wire, but I haven't heard any audio crackling, even though it gets pinched in the door of my console daily.    If you have an aux input in your car, this is a great way to cut down on clutter.