Chevrolet HHR 2010 Owner's Manual page 223

Radio Data System (RDS)
The radio may have RDS. The RDS feature is
available for use only on FM stations that broadcast
RDS information. This system relies upon receiving
specific information from these stations and only works
when the information is available. While the radio is
tuned to an FM-RDS station, the station name or
call letters display. In rare cases, a radio station could
broadcast incorrect information that causes the radio
features to work improperly. If this happens, contact
the radio station.
Radio with CD (MP3) and USB Port shown,
Radio with CD (MP3) similar
The vehicle has one of these radios as its audio system.
4-63