| 摘要 |
PURPOSE: A mobile phone which can function as a buzzer is provided to remove inconvenience that a user individually manipulates a buzzer at home. CONSTITUTION: A user inserts a card functioning as a buzzer into a mobile phone(3). If a visitor presses a buzzer, the mobile phone displays the visitor on a screen. The user of the mobile phone has a call with the visitor while watching the displayed visitor. The user opens a door or tells a visitor to come next time based on a need.
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