Video on-door speakerphones

Video on-door speakerphones are rather simple, but effective devices of safety of the apartment, an entrance of a house, the small house or a country house. The video on-door speakerphone allows to talk over with the visitor and to see his image on the tiny screen of the monitor. The video on-door speakerphone represents a bilateral video intercom and consists of the calling panel which is mounted, as a rule, on outer side of a door, and the monitor. When pressing the button on the calling panel the monitor publishes a melodious trill, that is, when using the video on-door speakerphone need for a usual traditional electrocall disappears, and on the monitor the image of space before an entrance door appears. On all monitors installed in houses there are buttons of opening of electrolocks.