Rugged Cams Workhorse DVR 4 Channel - Manual (Page 59)

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