The intercom is called a special device that allows you to identify a guest who has come without direct contact. Two main types of this equipment are currently produced. The first is an audio device that allows you to hear the interlocutor and talk to him. Such an intercom of several nodes consists of:
— The outer panel, which is mounted on the street, most often on the wall or door;
— Negotiation device that allows you to communicate;
— Control panels with which you can open the door if necessary.
Audio -domains, in turn, are classified into two large groups — symptomed and duplex. In the first case, during a conversation for switching between interlocutors, you have to press a special button on the panel. When using a duplex model, there is no need for this.
A more modern type of intercom is equipped with a video camera and display, this type of intercom can be viewed and purchased by your favorite model here — intercom/Catalog/Vyzyvnye -Paneli/. During its operation, you can not only hear, but also observe the interlocutor. In the event that the owner of the apartment or house has something to be afraid, it is worth choosing this particular option. After all, it is excluded that the ill-wishers will force one of the acquaintances to speak to the intercom forcibly.
This type of instrument can be equipped with a monochrome and color camera. In the first case, the picture looks, of course, much more attractive. However, monochrome equipment allows you to better see the interlocutor at dusk. A special infrared backlight is often installed on the outer panel of video intercoms.
In addition, all intercoms can be divided into multi -user and individual. For the moment, most Russians are familiar with the first type. After all, almost all modern entrances are equipped with such systems. Intermophones intended for individual use are usually installed in the private sector — country houses and cottages. If desired, you can purchase a model with button and sensory control. Devices are also produced, to which you can connect several monitors. It will be very convenient in private houses or apartments in which there are a lot of rooms.
To date, a variety of domains are produced. If desired, you can purchase both an inexpensive, monochrome system with buttons, and a more perfect model with a color screen. In this case, everything depends mainly on the condition of the wallet of the owner of the apartment.