| 摘要 |
PROBLEM TO BE SOLVED: To easily and quickly perform speech communication with a common entrance and an unlocking operation of an electric lock by a cordless slave unit by attaching an adapter that does not need electric circuit improvement to the existing interphone equipment. SOLUTION: In the existing interphone 100 installed in each dwelling unit of a multiple dwelling housing where an electric lock 400 is installed at a common entrance, a charge type cordless slave unit 700 and an adapter 600 consisting of a wireless transmitting and receiving part for transmitting and receiving voice and a radio signal, a controlling part capable of operating an inner switch or the like of the existing unit 100, etc., are attached by post- installation, and speech communication with the existing unit 100, the unit 700 and a visitor at the common entrance and the unlocking of the lock 400 can be performed.
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