Unlock the power of your factory navigation radio, the NU-GM51 is a plug-and-play kit that allows you to unlock navigation while in motion in select Chevrolet, Cadillac and GMC vehicles. Not compatible in vehicles that have an "IOA" or "IOB" build code. Build codes can be found on the silver sticker in the glove compartment. Plug-and-Play Navigation Unlock for Select Chevrolet, Cadillac and GMC Vehicles Enables a fully functional navigation system when car is in motion Destination input address enabled Bluetooth functions enabled Blu-Ray, SD and USB video playback MODEL NO - NU-GM51