Rugged Cams Workhorse DVR 16 Channel - Manual (Page 62)

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Go to another window using the arrow (STW X) buttons and press the [Select] button.
The audio recorded on the selected channel is then played.
4-9-5. Mute
Use Mute to block the sound of the selected channel.
In Play mode, press the [Mute] button on the remote control.
Drag the cursor to the upper right corner. On the popup menu, select [Mute]. An audio
icon is then displayed on Channel No. 1.