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1.Max Sound Output: 130 2.Max Gain: 50 ± 5 3.Harmonic Wave Distortion: ≤5% (AT 1000 Hz) 4.Input Noise: ≤ 30 dB 5.Frequency Range: 300Hz ~ 4000Hz 6.Working Voltage: 1.5V 7.Working Current: ≤ 6.8 mA 8...