2x3.5mm mono plug to 3.5mm stereo jack adapter this 2x3.5mm mono plug to 3.5mm stereo jack adapter converts an airplane connection to single 3.5mm stereo jack.With its full molded construction, this adapter will allow to use your headphones in any airplane.Black molded plastic construction nickel-plated contacts connector 1: 2x3.5mm mono plug connector 2: 3.5mm stereo jack use with pc, stereo, mp3 players external length / height: 38mm body width: 25mm