Osoto PH-130W - Manual (Page 12)

signal input, the indicator will be on red(other two indicators will be
off, when select RGB signal input,the indicator will be red（other
two previewing indicators will be off）.
Signal output to projector(shooting): Press this button
repeatedly to select visual presenter’s signal, PC signal, and RGB
signal’s output. When it is into asynchronous state, please select
visual presenter first, when PC and RGB signal output to monitor,
press this button again, image will output to projector, meanwhile
audio will output as followed, the indicator will become from
shinning red to red.
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Focus adjustment:
Adjusting focus button can change the range of CCD camera,
touching or pressing on or button, can magnify image
or deflate image gradually or continually.
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Brightness adjustment:
Adjusting brightness can change the output brightness from
CCD camera, touching or pressing on or button can
change the bightness,leting it go by hand will stop adjusting of
brightness.