I-View AnyNet-0401Mini Embedded NVR - Manual (Page 51)

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Video Loss
The NVR can send an alarm or other kinds of
notifications if there is any video signal loss from the
camera; either due to the problem of power supply or
bad video coaxial connections. To activate this
function, click “Video Loss” tab and follow the
instructions below:
Enable alarm siren: Set up an audio warning
siren sound (or recorded voice) when video loss