Monacor DVC–4 IO User Manual page 64

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Pre-event Recording : Record more key frames specified (0-2 key frames) ahead the frame with event.
Post-event Recoring : Record more seconds specificed (1-10 seconds) after the frame with event.
Min. Audio Level : 0 to 25
You can repeat the step 1 to 4 in order to set schedule on multiple DAY and TIME zones.
5. Click Exit button to save and exit.
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