The main equipment of the video surveillance system

Video intercoms: what is the device and what functions performs

The simplest models of the intercom are equipped with a small screen, which is installed inside the apartment and the call button (the simplest call). When you click on the call button, the screen itself, notifying about the person of the caller.

If desired, the video intercom can be equipped with several cameras and installed them in different places that are removed to an equal distance from the front door, so you can see the visitor from different angles.  In addition, some of the most advanced models of video intercoms have memory blocks where you can record images of all guests who visited you during your absence.