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). This interface is used in both on amplified and amplified models.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; Description_FAB Provides Accessory Power 12-Volt 10-Amp Description_FAB Retains R.A.P. Retained Accessory Power Description_FAB Provides NAV Outputs Parking Brake - Reverse - Speed Sense Description_FAB Pre-Wired Aswc-1 Harness Aswc-1 Sold Separately Description_FAB Retains Balance Fade Non-Amplified Models Only Description_FAB Can Be Used In Both Amplified And Non-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). This interface is used in both on amplified and amplified models. Description_SHO RadioModInt