| Typically when someone presses the call button on the outside video intercom unit or rings the door bell it activates the camera and alerts the indoor monitor. You can then talk to the person as you look at their image. Some video intercom units have built-in memory that will record the images of visitors who ring the buzzer. The memory will hold a time and date stamp as well. In addition, some higher end intercoms have a built in open button in which you can lock and unlock your door to allow visitors in.
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