Sometimes you need to take a mono signal and make it stereo.
Stereo always sounds better and fuller, so when you're talking audio, you want the final signal and the final result to be in stereo. This adapter will be able to do just that. It's a 3.5mm (or 1/8") stereo male to 3.5mm mono female adapter. Plug in your typical 1/8" connector (the size of the typical end on your headphones) to this connector and suddenly you have a stereo end.
Connector 1 : (1) 3.5mm Stereo Male