This Dahua door station is the outdoor entry unit for villa and apartment video intercom systems. It combines a camera, microphone, speaker and call function in an outdoor housing, allowing visitors to call residents and be seen and heard from the indoor monitor. The family supports IP connection as well as four-wire analog connection using AHD or CVBS video, which makes it flexible for both new network-based projects and buildings that already have four-wire cabling. AHD offers higher video quality than CVBS, so installers can choose the connection type that suits each project. Villa versions are intended for single households, while apartment versions handle many residents at a shared entrance.