Q-See QSNDVR16M User Manual page 58

for alarm 1, if any of the 3 sensors are activated, then alarm 1 will send an alarm signal.
ALARM BUZZER (Fig 3.2.37 Alarm buzzer)
ON: Start the buzzer when DVR gives alarm
OFF: The buzzer will not be triggered when DVR detects alarm
ALARM OUTPUT (Fig 3.2.38 Alarm output)
ON: Alarm on. When the alarm output is on, the DVR will send alarm when the sensor is triggered or a
motion event occurs.
OFF: Alarm off. The DVR will not send alarm when output is off.
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