| 摘要 |
PURPOSE:To supervise accurately a voice of an object to be supervised by a supervisory personnel of another room by providing an external microphone connecting terminal to a key telephone set. CONSTITUTION:When a switch 2 is thrown to the position opposite to that shown in figure, a talking circuit 1 is thrown from a handset 3 to a built-in speaker 7 and a built-in microphone 9 and the voice is inputted from an external microphone connected to an external connection terminal 10. Thus, the voice of the supervision object is supervised accurately by a supervisor by placing the external microphone near the object to be supervised.
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