Brand New ADS-MRR, Universal Radio Replacement Interface + HRN-HRR-GM5, Vehicle Specific T-Harness for SELECT GM Vehicles - Buick, Cadillac, Chevrolet, GMC, Hummer 2006 and UP. The iDatalink's HRN-HRR-GM5 wiring adapter allows you to connect a new car stereo in select 2006-Up Select GM Vehicles, working in conjunction with iDatalink's Maestro ADS-MRR module, which is included with this package. Once connected, you'll retain the use of your steering wheel audio controls and your factory amp in these vehicles. This ADS-MRR requires you to flash software from computer with USB cable Included. You will need to log in Maestro iDatalink website to be able to flash.