Provides accessory power (12-volt 10-amp) Retains R.A.P. (Retained Accessory Power) Used in amplified or non-amplified systems Retains chimes and balance and fade Provides NAV outputs (parking brake, reverse, mute and speed sense) Pre-wired AXSWC harness (AXSWC sold separately) Adjustable gain control for chimes and OnStar® High-level speaker input Antenna adapter included Retains factory backup camera Micro-B USB updatable