Provides accessory (12 volt 3 amp) | Retains R. A. P. if equipped | Used in non amplified systems or when removing amplified systems | Retains warning chimes | Uses Micro B USB | Provides 12 volt DC 3A accessory output | Built in speaker retains warning chimes | Designed to be used in non-amplified GM vehicles | Retains all the factory warning chimes that would be lost when the OEM radio is removed | Provides 12 volt DC 3A accessory output | Built in speaker retains warning chimes | Designed to be used in non-amplified GM vehicles | Retains all the factory warning chimes that would be lost when the OEM radio is removed