Metra BY-GM11-SWC stereo data interface used when replacing the OEM radio. When replacing the OEM radio with an after market 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 2006-2012. Provides Accessory Power 12-Volt 10-Amp. Retains R.A.P. Retained Accessory Power. Provides Nav Outputs Parking Brake/Reverse/Speed Sense.