PAC OS2X Radio Replacement Interface with Onstar Retention for Select GM Class II Vehicles Rear Seat Entertainment activation Provides Plug-in-connection for SWI module (sold separately) No Steering Wheel Button mapping required Retains OnStar when the factory radio is replaced Retains all safety warning chimes Radio replacement interface with OnStar retention for select gm class ii vehicles with or without BOSE sound system Rear seat entertainment activation Provides plug-in-connection for SWI module (sold separately) No steering wheel button mapping required In-Field updateable firmware via USB (using PAC-UP)