Splits your one 3.5mm headphone socket into 2 sockets so you can connect 2 headphones at once. 3.5mm is the size commonly used on portable stereos (including the iPods) and computers. Good quality splitter. A white lead with gold plated connections. Stereo adapter. The advantage of the short leads is that you can plug and unplug headphones without putting strain on the source socket. Stereo adapter. White lead designed to be compatible with the iPod design.