The IP address of the camera can be accessed from the web page. In the configuration-audio and video-audio, if the camera has an external pickup, the audio input type should be selected as Line in; if the camera has a built-in pickup, the audio input type should be selected as MIC in. If the volume of the audio input device in the camera is adjusted high, noise or noise may appear after the gain of the video recorder. At this time, the audio input can be reduced to adjust the test.