These jointers/couplers are used to connect your PS2 / Ipod video /iRiver video/Digital Camera to video monitors (such as portable DVD players, portable TVs …). Normally the PS2/digital camera/iPod video comes with a RCA composite AV cable which has male connections like this picture:
This cable can easily connect to a home TV as most of the home TV has female composite AV input which looks like this pciture:
but most of the portable DVD player/portable video monitors also has male connection so it can be easily connected to the main TV set at home.
so if you want to connect the iPod video/digital camera to a portable DVD player, it will need this jointers:
As you need one for video channel and one or two for the audio channel, so these are selling in 2 pcs or 3 pcs, please select the option at the bottom.