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1.Max Sound Output: 129dB ± 4dB 2.Max Sound Gain: 45dB ± 5dB 3.Harmonic Wave Distortion: ≤5% 4.Input Noise: ≤30dB 5.Frequency Range: 450HZ~3500HZ 6.Working Voltage: 1.5V 7.Working Current: ≤3.0mA 8...