Sony XT100HD HD Radio Tuner (Discontinued by Manufacturer) High-fidelity FM/AM Digital Radio with HD Radio Technology; Built-in Sony Bus connectivity for external source; Compatible with most 2005 headunits and later that are SAT Radio Ready High-fidelity FM/AM Digital Radio with HD Radio Technology Built-in Sony Bus connectivity for external source Compatible with most 2005 headunits and later that are SAT Radio Ready