PAC OS-2C BOSE OnStar Interface for Class II Vehicles Equipped with Factory Bose Systems: * Plug and play — no cutting or splicing into factory plug * Communicates directly with OnStar module to prevent false triggering and eliminating unwanted audio noise * On-board amp will drive two 4W speakers in stereo * Use with existing factory speakers or external speakers * For Class II Vehicles Equipped with Factory Bose Systems * Includes chime module