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SPK: Ф30 Mylar speaker Impedance:32±15% Ohm Sensitivity:98±4dB Effective Freq.Band:20Hz-20KHz Rated input power:10mW Max.input power: 50mW MIC:Ф6.0X5.0mm Sensitivity:-52±2dB at 4.5V,2.2KΩ (0dB=1V/Pa,1KHz) Directivity:Omnidirectional Effective Freq. Band:20Hz-20KHz Max.operation voltage:10V Standard operation voltage:4.5V