Box Type Rechargeable Hearing Aidproduct information: Material: Paint Specification: black Health Products Product Name: Amplifier Maximum saturation sound pressure level: 129dB+3dB Output sound pressure level (high frequency average): 120dB 4dB Full range sound gain (high frequency average value): 40dB 5dB The frequency response range is not narrower than: 450Hz ~ 3000Hz The maximum actual measured value of total harmonic distortion should not exceed: 109 The actual measured value
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