Easily replace the Class II factory radio in your Cadillac vehicle with this Radio Replacement Interface with OnStar Retention by PAC. The OS-2C-CTSX allows you to install an upgraded aftermarket radio without losing important factory features such as OnStar, the factory-amplified sound system, and warning chimes. This radio replacement interface is plug-and-play for simple installation. | Pac | | Radio Replacement Interface with OnStar Retention for Select Cadillac Vehicles | Blue | Best Buy