Provides accessory power (12-volt 10-amp) Retains R.A.P. (Retained Accessory Power) Provides NAV output (parking brake, reverse and speed sense) Retains chimes Retains audio controls on the steering wheel Retains OnStar®/OEM Bluetooth® Adjustable volume for OnStar® Retains factory AUX input Designed for amplified or non-amplified models Retains balance and fade Micro-B USB updatable