Topfield TF3000FEi User Manual page 10

REMOTE CONTROL UNIT (RCU)
Selects the previously viewed channel.
Selects the TV/Radio mode.
Changes the terrestrial TV and Satellite mode.
Selects LEFT/RIGHT/MONO/STEREO sound function.
Selects the subtitle language list for the current service.
Enables the teletext with software emulation.
Displays the favorite channel list.
Displays and alters the UHF setting in menu.