Building intercom is a security system. That is, in multi-storey or high-rise buildings to achieve visitors, residents and property management center to talk to each other, exchange information and achieve safe access control of the community management system, commonly known as building intercom system.

Visitors can easily call the residents and talk with them through the host in front of the downstairs unit, and call the property management personnel without the key to help open the unit door lock, and the residents can also control the opening and closing of the unit door inside the household, and the residents can operate the indoor extension to call the property management personnel. The door host can also receive the resident alarm signal at any time to the host on duty to notify the community security personnel, the system not only enhances the high-rise residential security work, but also greatly facilitates the residents, reduces many unnecessary upstairs and downstairs trouble, and the communication is more convenient, fast and safe.