Provides accessory power (12-volt 10-amp), Retains R.A.P. (retained accessory power), Used in amplified or non-amplified systems, Retains chimes, Provides NAV outputs (parking brake, reverse, mute, speed sense), Prewired AXSWC harness (AXSWC sold separately), Retains OnStar/OE Bluetooth, Adjustable volume for chimes and OnStar, High level speaker input, USB CAB cable updatable, Retains balance and fade.