Simply plug the 3.5mm jack plug into a portable music player Pod CD player pop the cassette into the car radio cassette and play music through your car stereo Compatible with car cassette decks that have side tape opening Self-adjusting spring head and silent mechanism Mini-jack plug inserts into MP3 player/for iPod or CD player's headphone jack Compact and portable Near CD quality Car cassette decks that have side tape opening and any MP3 player / Pod / Phone / Mobile Phone that has the normal 3.5mm audio headphone jack. Note:When use it please control the volume under 30%-40%otherwise may take some noise. Original box: NO Color: Black Net weight: 34g Package weight: 43g Packet content: 100% Brand New 1 x Black cassette adapter