Goliton Car audio cassette tape adapter for iPod MP3 MP4 Phone CD Player Simply plug the 3.5mm jack plug into a portable music player, pop the cassette into the car radio cassette and play music through your car stereo. Car cassette decks that have side tape opening and any MP3 player/ iPod / iPhone / Mobile Phone which has the normal 3.5mm audio headphone jack. Self-adjusting spring head and silent mechanism. Mini-jack plug inserts into MP3 player/for iPod or CD player's headphone jack.