| 摘要 |
transmitting a ring sound of a bell and sound signal of a visitor by receiving a signal transmitted by FM modulating a call signal and sound signal of a visitor, then radio paging through the antenna, with a remote controller; displaying the image of the visitor by outputting it to input through the monitoring camera to the specific channels of each indoor TV by a mixing device; and then radio paging the talk with the visitor through the remote controller and also radio paging a control signal indicating whether to close or open the door.
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