When replacing the OEM radio with an aftermarket radio some feature can be lost. Using our interface you can retain those features. This interface will also provide you navigation signal outputs ( parking brake, Reverse, and Speed sense)Specifications: WARNING CA Proposition 65 Yes WARNING CA Proposition 65 Message WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov Description_DES Data Interface Description_EXT Data Interface; w/SWC; Description_FAB Provides Accessory Power 12-Volt 10-Amp Description_FAB Retains R.A.P. Retained Accessory Power Description_FAB Provides Navigation Outputs Parking Brake/Reverse/Speed Sense Description_FAB Retain Chimes Description_FAB Retains Audio Controls On The Steering Wheel Description_FAB Retains OnStar / OE Bluetooth Description_FAB Retains SAT Satellite Radio Description_FAB Can Be Used In Non-Amplified Or Amplified Models Description_MKT When replacing the OEM radio with an aftermarket radio some feature can be lost. Using our interface you can retain those features. This interface will also provide you navigation signal outputs ( parking brake, Reverse, and Speed sense) Description_SHO RadioModInt