The DP-121Q displays an image of a visitor in real time on the phone’s monitor. A built-in microphone and speaker on the camera lets users communicate with visitors and grant them entry with a push of a button. The camera turns on automatically when a visitor calls or can be turned on manually to provide surveillance of an entrance. The video door phone comes with a single monitor and a camera. Other features include six LEDs built into the camera for nighttime operation, a CCD camera chip, adjustable contrast, brightness and ringer volume as well as a built-in camera-angle adjustment.