(The setting of this system is to allow residents to understand the situation of visitors, and to determine whether to allow visitors to enter the door through dialogue and images, in order to improve the security and anti-theft capability of the house and the safety of residents, and to relieve the trouble of running up and down when guests visit. Usually, a normally locked door is set in the foyer of the unit building. Residents can use the key or password (or contactless IC card) to unlock and enter. Can enter the gate. Building video intercom system is divided into: 1. Non-security video intercom system; 2. Security video intercom system. At the same time, it can be divided into network type and non-network type. When it is network type, there is a management core in the community, and each building of non-network type is an independent system.)
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