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Audio Record Volume :
You can adjust the volume level value for the audio input in 1 to 10;if there are
some noise please adjust the volume to lower, otherwise you can select higher volume for audio recording.
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Microphone Selcet:
You can select the build in microphone or external microphone as your audio source;
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Overwrite:
If your selection is ON ,the DVR will stop recording once the SD Disc becomes full, if your
selection is Off, the DVR will continue to record by writing over the old files once the SD Disc becomes
full;