Reolink PoE NVR.
Step 1. Enter Menu>>Recording>>Encode. Choose the Camera No. you want to set and Encoding Parameters as Main Stream, then tick the Record Audio and click Apply to save the configuration.
Step 2. Enter Menu>>Display>>Output, tick the Audio and click the Apply button to save the configuration
Note: If you connect the NVR to your TV monitor by the HDMI, please set the Resolution to 1920*1080 so that you can get the audio output on your TV monitor.
For the single channel, you can turn on the Audio in the Camera Tool Bar by Left click the USB mouse once on one of the live video channels available.