In advance I hope not to offend if this has already been addressed or in the wrong section. I am very new to cctv and am at a loss trying to add audio to my cctv system. First off I have 4 laview IP cameras and also a Laview 8 channel NVR. Everything works fine even though it’s probably lower end. Recently I purchased another Laview IP cam that is advertised with audio capabilities ( LV-PD6240-VF ). It has audio in and out 3.5 mm jacks. Also has internal 12 volt +/- connection. My question is how to add a mic. The NVR is connected via hdmi to three monitors/ TVs through my home for remote viewing. It has audio in and audio out single RCA jacks. I’ve tried several ways and no luck? I have enabled audio through the camera properties software in the NVR. I purchased a very low price generic mic and any help or advice would be appreciated.