- For connecting MP3/CD players and smartphones to car radios with a cassette compartment ,- Gold-plated plug with low contact resistance for secure signal transmission ,- Connection to the player (headphones or line output) with a 3.5 mm stereo jack plug ,- Ideal when a radio has no jack connection - Connection: 3.5 mm Jack Plug ,- Model: Adapter Cassette ,- Colour: White 2 years legal warranty only