The use of intercom began in the twentieth century. True, the equipment that was used from the middle of the twentieth century in Moscow and in other cities and was installed on ceremonial residential buildings- it is unlikely that a modern person could call it perfect. The buttons that showed the combination of code were quickly erased and a year after the start of use, everyone could understand what code needed to be drew to open the coveted door.
Modern intercoms are not so simple and are a more modern device to ensure security. You can buy an intercom in an online store an intercom for any budget – visit a site on which the intercoms are presented in the assortment. Here you can choose both very economical equipment and buy Fermax intercoms for which depends on the model, and functionality exceeds products from competing brands. Such a device will be this equipment to ensure safety. The intercom can be installed as suitable for a private house, an apartment building, in a private sector, in buildings of various directions.
Some intercoms only allow you to communicate with the guest who gained the apartment code. Other, more modern models, in addition to audience, also allow you to see a person who came to visit. Small cameras make video intercoms more modern device in technical terms.