Rugged Cams Workhorse DVR 16 Channel - Manual (Page 63)

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Press the [Mute] button. The Audio Output icon is then displayed as shown below:
4-9-6. Smart Search
Use Smart Search to search for object motion in a certain zone quickly.
In Play mode, select the [Search] button on the remote control.
Drag the cursor to the upper right corner. On the popup menu, select the [Smart] button.