you can just Insert this item to the back radio directly
match your phone or pad to bluetooth module.and Choose Aux from your radio, then you can use your phone to play music through car speakers.

Condition:100% Brand new

Material:ABS Plastic

Include:1 x Bluetooth module radio stereo Aux cable adaptor

length: 25cm

Fits:

For BMW 5 series (E60) 2003 - 2010.
For BMW 5 series (E61) 2003-2010.
For BMW 6 series (E63) 2003 - 2010.
For BMW 6 series (E64) 2003 -2010.