PAC NU-GM3 Navigation Unlock Interface for Select 29-Bit GM Lan Vehicles Unlocks Destination Entry Unlocks Bluetooth Key Pad Enables the Reverse Camera at Any Time Navigation Unlock Interface for Select 29-bit GM LAN vehicles Allows the Factory Navigation, DVD and Reverse Camera features of your GM radio to be used by the passenger at any time Confirm safe use Passenger must confirm for the navigation features to be unlocked Text Displayed on Radio Utilize XM/Sirius while in motion