This Data Interface Harness for select 2001 and up Mercedes Benz vehicles allows you to easily remove the factory stereo and replace it with an aftermarket stereo and retain all of the factory functions. Provides accessory power |12 volt 10 amp| and NAV outputs |Parking Brake, Reverse, and Speed Sense|. Retains R.A.P. |retained accessory power|, balance and fade, is Micro B USB updatable and is designed for non amplified models or bypassing amplifiers. Includes pre wired ASWC 1 harness |ASWC 1 module sold separately|