Adding an auxiliary input to your BMW is pretty easy to do, as long as you know what you're looking for. Chances are, if you've found us, you're on the right path. Our BMW aux inputs allow you to connect any smartphone, MP3 player, DVD player or any other device equipped with a 3.5mm auxiliary input to your factory stereo. Our adapters work via CD changer or satellite radio emulation. This means that the BMW radio will use the radios CD changer capabilities in order to connect to the back of your factory BMW radio to provide an auxiliary input jack.