Pac OS-311 (R) OS-311 OnStar(R) Interface for Select GM(R) Vehicles (GM(R) 14- & 16-pin)

? Replaces factory radio in GM(R) SUVs & trucks while retaining OnStar(R);? Plug & play--no cutting or splicing into factory plug;? OS-2/OS2-BOSE communicate directly with the OnStar(R) module to prevent false triggering & eliminating unwanted audio noise;? Onboard amp will drive two 4W speakers in stereo;? For use with the existing factory speakers or external speakers;? GM(R) 14- & 16-pin;? Includes chime module & antenna adapter;