Intercom with three indoor units


It applies to family uses with three rooms upstairs/downstairs, when visitors ring the bell from outside, three-room phone ringing sounded the same time, picking up the indoor telephone, people can talk with the visitors while can also press the unlock button to unlock the door automatically, in that case people don’t have to move to open the doors.

Built-in digital circuit and microcomputer- controlled circuit. One outdoor unit can call 2-3 indoor units for duplex intercommunication. Any indoor unit can call 2-3 other indoor units Each indoor unit can have confidential talk with the outdoor unit.


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