Connects 2 Aux Input to OEM Adapter Interface for BMW with Philips/Blaupunkt/Becker Business RDS/CD/Professional/Navi - Pre-wired Headunits suitable for: BMW 3 Series E46 : 1998 to 2005BMW 5 Series E39 : 1996 to 2003BMW 7 Series E38 : 2000BMW Mini : 2000 OnwardsBMW X5 E53 : 2000 OnwardsPLEASE NOTE: Please check the connection in your vehicle prior to ordering as you could possibly have a ROUND PIN CONNECTION or a FLAT PIN CONNECTION. This will determine the correct lead you need to purchase.This auxiliary input interface connect to original head units via the CD changer port and trick the unit into believing it is playing a CD changer, whilst really playing the audio from another sources. This means the audio can be produced at a much higher quality.