GROM BMWSA1 Select BMW Mini MP3 Smartphone Auxiliary Adapter Kit -Behind The Radio Installation Plugs to the extension port of your car stereo. Plug-and-play operation. No need to splice into factory wiring Works as an AUX Input converter for any MP3 player, phone, DVD, XM, Android and iPod/iPhone Your stereo should be CD changer capable. The in-dash CD changer will remain working, but external CD changer will be disconnected. ATTENTION: Please see compatible cars in Product Description. For help with installation please watch "GROM Audio" video channel at YouTube.com.