iPlug 3.5mm Earbud Splitter Cable for iPod White
Used it on an airplane for two people watching a movie on a laptop. Initially one of the headsets received no signal, but after twisting the plug left/right a couple of times it started working and we had no more problems. The sound was as good as when the headphones were pluged directly into the laptop. The quality of the signal to both headsets was the same. Happy.<br />Amazon gets enthusiastic 5 stars for rapidly and flawlessly facilitating the purchase