Video door phones, also known as video intercoms or video door entry systems, are security devices used for managing and monitoring entry to residential or commercial properties. Comprising a camera, microphone, speaker, and display screen, they are installed near entrances, enabling occupants to see and communicate with visitors without opening the door. When a visitor rings the doorbell, the camera captures their image, and residents can view the live video feed and converse with them through two-way audio. This technology enhances security by allowing visual verification of visitors' identities before granting access, often with additional features like motion detection and remote smartphone access for added convenience.