Provides accessory (12V 10A) ; Retains RAP; Provides NAV outputs (parking brake/reverse/speed sense) ; Used in nonamplified models or when bypassing a factory ampl; Used in models without OnStar(R) ; Retains all warning chimes ; High-level speaker input ; Retains balance & fade ; Micro-B USB updateable; Compatible with Buick(R) Aurora 2001-2003, Bonneville 2000-2005 & Le Sabre 2000-2005;