Provides accessory power (12-volt 10-amp) Retains R.A.P. (Retained Accessory Power) Used in amplified, non-amplified systems, or digital amplified systems Retains chimes (in GM) Turn signal click (in GM) Provides NAV outputs (parking brake, reverse, mute and speed sense) Retains On Star®/OE Bluetooth® Adjustable gain control for overall volume (on amplified systems) Adjustable gain control for chimes and On Star® in GM Retains SYNC® in Ford (if equipped) Adjustable gain control for SYNC® (Ford) High-level speaker input Micro-B USB updatable Retains balance and fade (If you have a digital amp and you prefer to retain fade control, use the AXADBX-1 excluding Ford and VW vehicles)