Night Owl NODVR108-500GB - Manual (Page 39)

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13.3 Alarm Setup Menu
Use this menu to configure the alarm and post recording settings.
To access the Alarm Setup menu select Record Functions from the Main
Menu, and then Alarm from the Record Functions menu.

Buzzer: This will enable/disable a beeping sound from the DVR if
alarms have been detected. Select the duration of the alarm
between 0-60 Seconds.

Post Recording: Select the duration that the DVR will record after
an alarm is triggered.
Chapter 13 Record Functions Menu