Introduction Griffin GC38517 iTrip DirectDeck Cassette Adapter - Black. This cassette adaptor is the easiest, most convenient way to listen to any portable audio player through your car's stereo. Plug the audio jack into the headphone port of your iPhone, iPod, MP3 player, CD player, or other portable audio device. Insert the cassette adapter into your cassette player and start jammin' to your tunes in the car! Product Features: Listen to music from your MP3 player, iPhone, iPod or Smartphone through your car's cassette player. Simply connect the 3.5mm jack on the cassette adapter to your device. Works with any audio device which has a standard 3.5mm jack.