A video door phone, also known as a video intercom or video doorbell, is a communication device used to monitor and manage visitors at the entrance of a building or residence. It consists of a camera, microphone, speaker, and display unit or mobile app interface. When a visitor presses the doorbell button, the camera captures their image and the microphone allows them to communicate with the occupant inside. The occupant can see and hear the visitor on a display unit installed inside the building or on their smartphone if the system is connected to a mobile app. This allows for visual verification of visitors before granting access, enhancing security by preventing unauthorized entry. Modern video door phones often include additional features such as night vision for clear visibility in low-light conditions, motion detection sensors to alert occupants of approaching visitors even if they do not press the doorbell, and remote access capabilities that enable users to view and interact with visitors from anywhere via their mobile device. Overall, video door phones provide convenience, security, and peace of mind by allowing occupants to screen visitors visually and communicate effectively without having to open the door. They are widely used in residential buildings, offices, and gated communities to improve access control and enhance overall safety.