This Dahua indoor monitor is the resident-side unit of the IP, four-wire AHD and four-wire CVBS video intercom family. Mounted on a wall inside the apartment or villa, it displays the video from the door station, lets residents talk with visitors and releases the door when they decide to let someone in. Because the family supports both IP and four-wire analog connections, the monitor can be specified for modern networked buildings or for projects that rely on existing four-wire cabling. This flexibility helps installers keep costs under control during refurbishment while still delivering a clear, dependable intercom experience. The monitor is intended to be paired with Dahua door stations from the same family.