METRA ONSTAR LAN 29 INTERFACE For Installing An Aftermarket Radio In Vehicles With Either GMLAN 11 Or GMLAN 29 Bit Data Systems To Retain OnStar/ OE Bluetooth Functionality/ Warning Chimes/ Factory Steering Wheel Controls; Provides 12 Volt 10 Amp Accessory Power Output; With Outputs For Navigation Radios That Include Parking Brake/ Vehicle Speed Sense (VSS)/ Reverse And Mute; Black; With Adjustable Gain Control And USB Updatab