I just installed a bluetooth version of this device, it plugs in to the DIN socket on the back of vintage Becker radios and allows you to plug in an audio player (old iphones will work as is, new ones with no mini plug will need an adapter to go from Lightning to mini plug). Works great, when you insert the mini plug it switches off the am/fm and goes into aux mode, unplug it and it goes back to radio. Free, just pay me for shipping.
