Female AUX Auxiliary Audio Input Adapter Cable For BMW E60 E61 E63 E64 Fits 2004+ BMW 5-Series, M5, 6-Series, M6 and 7-Series. Easy to Install. Simply plugs into rear of factory radio Audio from the auxiliary input is selected using the "mode" button on your radio. If you don't have 'AUX' option, after the installation work car must be programmed / coded by BMW dealer or your mechanic There is no loss of sound quality