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3.9 Audio output settings
The camera can be connected to an external speaker, select "3.5mm"
Select "HDMI" to directly output to TV or monitor;
This option is an audio output interface. If the output cable is HDMI-HDMI cable, you can
choose HDMI output. If the signal cable is HDMI-VGA cable, you can choose 3.5MM
output. At this time, you can connect a 3.5mm speaker as an alarm output.