Building intercom system is installed in each unit security door opening, by the cell s control center administrator switchboard, intercom host building entrances, electric locks, door closers, and the user s home video intercom extension through a dedicated network of in order to achieve visitors and residents intercom. Household remote control to open the security door, each unit stairs host visitors by intercom call households, before entering the building after the consent of the other, thus limiting the illegal workers entering. At the same time, if unexpected events, residents can notify security personnel through the system in order to receive timely support and treatment.

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