Intercoms today remain common access control and security systems. Convenient intercoms with video surveillance. They allow not only to talk with the visitor, but also to see him on the monitor screen: did one come, what did he bring with him.
Video on-door speakerphones consist of a call unit with a built-in camera, a monitor and a cable that connects them to transmit audio and video signals. There are also wireless intercoms, they are more convenient for installation in apartment buildings. Manufacturers equip video doorphone call units with LED camera lights.
Video surveillance systems are the most important components of technical security systems. The abbreviation CCTV (Closed Circuit Television) has taken root in the professional language. The main purpose of the CCTV system is to ensure the security of the facility by visual monitoring of the situation and video recording.
With the development of digital technology, video surveillance systems are becoming more intelligent. They allow not only to determine the movement of objects in the observation area, but also to recognize license plates and even people's faces.
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