CCTV Camera Pros Geovision 8.4 Multicam Digital Surveillance System - Manual (Page 129)

Configuring Main System
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1.20.4 Deactivating Video Lost Beep
To stop a beep noise when any of videos lost, click the Configure button (No. 14, Figure 1-2), point to
Tools, select Video Signal Diagnostic, and select Disable Video Lost Beep.