| 摘要 |
PROBLEM TO BE SOLVED: To suppress howling, without making moderate sound quantity of a loudspeaker. SOLUTION: A remote controller 1 is constituted by storing a loudspeaker 14 in a case space 30 surrounded by a lower case 20 and an upper case 21, and storing a microphone 7 in a recess 21c of the upper case 21, and partitioning the microphone 7 and the loudspeaker 14.
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