PLANET DVR-1672 - Manual (Page 62)

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7.7 Main Display
The main display area is where the live image of DVR is shown. You can drag to change
the location of the screen for each channel and turn On/Off audio signal by clicking the
mouse.
7.8 Audio Control
In live mode, you can turn On/ Off the audio signal of Ch1~Ch4 (4CH DVR supports
only 1Channel audio recording):
「 」 Audio signal is On
「 」 Audio signal is Off
Turn On/Off by clicking on the graphical icon, please note that each time only one
audio signal channel is allow turned on.