I-View DM-5MIPN 5-Megapixels Vandal Proof Dome IP Camera - Manual (Page 45)

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Audio setup: Click this button to setup the audio recording, it supports the gain from 1-100. there
are 2 audio codec (G7.11 uLow and a Low modes)
Privacy Mask:
Privacy mask enables you to cover certain areas on the live video to prevent certain
spots in the surveillance area from being live viewed and recorded. Enable Privacy mask function,
click and drop the left button of Mouse for setup up the mask.
Allow setup several mask areas, but the total areas cannot exceed 5% of image.