New Metra WM-GM11-SWC is a radio interface for select 2000-2013 General Motors vehicles. It allows you to connect an aftermarket radio to your factory wiring harness and retain the use of your steering wheel controls. It also provides accessory power retains chimes R.A.P. (retained accessory power). When replacing the OEM radio with an aftermarket radio some feature are lost. With this interface most of those features are retained. This interface will provide and retain 12 volt accessory power provide navigation outputs retain chimes retain steering wheel controls and retain balance and fade. This interface will work in non-amplified models in select Chevrolet/Pontiac/Saturn 2000-2013. The WM-GM11-SWC is a great option for anyone who wants to upgrade their factory radio without losing any of the features they love. It is easy to install and comes with all the necessary hardware. For over 70 years Metra has maintained its cutting edge by paying attention to our marketplace and innovating products to fit the needs of the installer. We are the Installer s Choice because we are installers.