See also:

Conference Call
When two calls are in progress (one active and one on hold), press and hold the button until you hear a double beep indicating that the two calls have been joined into one conference call. ...

DISC/AUX Button
Pressing the DISC/AUX button will allow you to switch from AM/FM modes to DISC/AUX mode. ...

Operation Instructions — CD Mode For CD And MP3 Audio Play
NOTE: • The ignition switch must be in the ON or ACC position to operate the radio. • This radio is capable of playing compact discs (CD), recordable compact discs (CD-R), rewritable compact d ...