Applies to: All Reolink NVRs.
Please refer to the steps below to troubleshoot:
Step 1. Make sure the loudspeaker attached to the Audio Out jack of the NVR works fine. The USB cable of the loudspeaker also needs to be plugged into the USB port of the NVR to power it up.
Step 2. Go to Menu->Display->Output, make sure the audio output of the NVR is enabled like the picture below. Please check the Audio box in the picture.

Step 3. Then please click on Recording on the left side menu to choose the channels for the cameras. Please make sure Record Audio box is checked as well as the picture below.

Note: If the audio icon appears on the live view screen after operating as above, that means you've enabled audio successfully.

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