Jaguar audio input adapter , this aux interface will allow you to input audio into the Jaguar factory car stereo, the interface will plug into the cd changer cable in the trunk or glove box  cd changer needs to be unplug the auxiliary kit allows you to listen to an external audio device mp3 iPod iPhone through the factory Jaguar car stereo no more sound degrading fm modulator, transmitter, or tape adapters this is not a universal part the interface was made to be used on Jaguar s type vehicles,you can also plug the auxiliary adapter behind the factory radio use  Jag-aux