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1.Max Sound Output: ≥125db 2.Max Sound Gain: 50db ± 5db 3.Harmonic Wave Distortion: ≤ 3% (AT 1000 Hz) 4.Input Noise: ≤ 30 db 5.Frequency Range: 300Hz ~ 4500Hz 6.Working Voltage: D.C 1.5V 7.Working ...