You could follow the steps below to enable/disable audio for recording and live viewing on your NVR.
Applies to: RLN8-410 (hardware version H3MB18/N2MB02/N3MB01/N7MB01), RLN16-410 (hardware version H3MB18/N6MB01), RLN36
Here is a video for your reference.
Step 1. Log in your NVR on a monitor, then go to Setting > Camera > Audio and Light page. Choose the channel that you want and click the Record Audio button.
Step 2. Left click live view image of the camera to pop up the toolbar, click the speaker icon to enable audio for this camera.
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