Saturation Sound Pressure Level

Also known as maximum sound output, this reflects the power of the hearing aid. Internationally, hearing aids' saturation sound pressure levels are categorized into five classes: low power, medium power, medium-large power, high power, and extra high power hearing aids. When choosing, users should select a hearing aid with different power levels based on the degree of their hearing loss.

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Full-Range Sound Amplification

This primarily indicates the amplification capability of the hearing aid. The higher the value, the stronger the amplification capability of the hearing aid.

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Frequency Range

Refers to the effective amplification range of the hearing aid. The larger this range, the closer it gets to the normal range of human ears.

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Equivalent Input Noise

Indicates the thermal noise generated by the hearing aid's amplification circuit, generally kept below 30dB SPL. The smaller the data, the less noise produced.

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Harmonic Distortion

Used to measure the fidelity of the hearing aid to sound. National standards specify that total harmonic distortion for behind-the-ear and in-the-ear hearing aids should be less than 5%. The smaller the value, the higher the fidelity of the hearing aid to sound.

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