Q-See QSW8209 - Manual (Page 8)

you press the Eliminate Alarm Button. Within 1 minute the motion alarm starts
the next alarm circle.
Sound Alarm Setup:
This alarm will detect sound. If you slide the alarm setting switch to the Sound
position, and select the Sensitivity level, the system enters sound alarm mode.
When sound is detected, the alarm sounds until you press the Eliminate Alarm
Button. When the alarm sounds the screen will also display the video unless you
have pressed the Sleep button. Within 1 minute the sound alarm starts the next
alarm circle.
Off Alarm Setup
This option turns off the alarm function. If you slide the alarm setting switch to
the Off position. The alarm function is disabled.
Note:
If the camera is being powered by dry batteries and you plug in the power
adapter, the alarm function will not work until you slide the power off switch
to the ON position. The alarm function will then be reactivated.
4-2. Setting up the Receiver
1. Connect the receiver to the adapter and then slide the power switch to the ON
position.