This cable is used to connect your iPhone, iPod, or other MP3 player to your home entertainment system. Connect the 1/8″ (3.5 mm) stereo plug into your player's headphone or line-out jack. Then connect the right and left RCA plugs to your speaker system's audio in jacks. The 6 feet of heavy-duty coiled cable in between resists tangling. Our StereoConnect Cable is a must-have for your home stereo and your MP3 player.