See also:

Listen To An Audio Source On Channel 2 While A Video Is Playing On Channel 1
Ensure the Remote Control and Headphone switch is on Channel 2. ...

Buttons 1 - 6
These buttons tune the radio to the stations that you commit to pushbutton memory (12 AM and 12 FM stations). ...

Controls
The headphone power indicator and controls are located on the right ear cup. NOTE: The rear video system must be turned on before sound can be heard from the headphones. To conserve battery lif ...