會議麥克風產品GC-520參數：
Element: Back Electret Condenser ;
Polar pattern :Uni-Directional ;
Frequency response:50-16KHz ;
Sensitivity :- 45dB±3dB ;
Output impedance :1000Ω±30% ;
Power Supply :1.5-1.6V DC

補充說明：
會議麥克風，產品型號：GC-520

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