you can just Insert this item to the back radio 

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:

Porsche 2009-2012 CDR30/31 PCM3