Rugged Cams Workhorse DVR 4 Channel - Manual (Page 147)

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1-2. Description of the Basic Features
The user can view the channel on full screen by clicking any of the following numbers:
Zoomed-in view of Channel No. 2
Clicking Live screen causes the channel to be selected and the border of the corresponding
screen to be displayed in a different color (the figure above shows the case where in Channel
No. 1 is selected).
The user can also view the channel on full screen by double-clicking the channel.
1-3. Audio
Click the Audio button to control the volume.
After adjusting the volume, click the Close button to exit the menu.