Extend the length of your headphone cable on your iPod, MP3 player, or other 3.5mm stereo device with this extension cable. 12' ft Foot 3.5mm Stereo Audio Computer Cable Cord M-F Extension Male to Female. 12ft 3.5mm Stereo Cable - M-F 12 Foot Extension Male to Female by Genius Cable. Solid connection, durable coating, and a great price. You can use these as auxiliary connection extenders to make an existing 3.5mm cable longer.