InFocus TD30 - Manual (Page 22)

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VOL Press VOL▲ button to increase volume
and VOL▼ button decrease volume.
CH Press CH▲ button to select the channel
forward and CH▼ button to select the
channel backward.
MTS
Press this button to set the sound to
MONO/Stereo/SAP (Note: Input signal
should has more than 2 languages.)
FAV Press this button to switch your favor
channel.
CH ± Press this button to add current channel
into memory when + shows, or delete it
when – shows.
FAV ± Press this button to add your favor into
memory when + shows, or delete it when –
shows.