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 and RLN12W.

Here is a video for your reference.

Step 1. Log in your NVR on a monitor, then go to Setting > Camera > Audio and Light. Choose the channel that you want and turn on the Record Audio button. settings.png

enable_audio_2.png

Step 2. Left click live view image of the camera to pop up the toolbar, click the Speaker icon to activate audio for this camera.

audio.png