Axxess interface that can be used when replacing the factory radio in select Porsche 2004-2009. This interface provides Navigation outputs required when installing a Navigation radio. This interface will also retain the MOST 25 amplifiers (select vehicles). This interface will also retain the steering wheel control functions for a all-in-one solution.Specifications: WARNING CA Proposition 65 Yes WARNING CA Proposition 65 Message WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov Description_DES Amplifier Retention Interface Description_EXT Amplifier Retention Interface; Retains Nav Outputs/Steering Wheel Controls; Retains MOST25 Amplifiers In Select Vehicles; Description_FAB Amplifier Retention Interface Description_MKT Axxess interface that can be used when replacing the factory radio in select Porsche 2004-2009. This interface provides Navigation outputs required when installing a Navigation radio. This interface will also retain the MOST 25 amplifiers (select vehicles). This interface will also retain the steering wheel control functions for a all-in-one solution. Description_SHO RadioModInt