Max Sound Output: ≥120 dBMax Sound Gain: ≥30 dBHarmonic Wave Distortion: f<1000Hz≤10%,f>1000Hz≤4%Frequency Range: 250～3800 HzInput Noise: ≤50 dBBattery: AG5 Working Voltage dc1.5V Working Current: ≤4mA
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