产品由麦克风、数字处理器(DSP)、受话器组成。主要技术指标：外观应整洁、光滑，表面不应有凹痕、划伤、裂痕、塑料件起泡、变形等现象。
耳背式助听器使用纽扣式电池，合格的产品使用寿命应在200小时左右，按每日使用12小时计算，有效使用期限约为两周。
BTE button battery life, the qualified products should be in 200 hours or so, is calculated by using 12 hours a day, period of validity for about two weeks.
就是耳背式助听器的耳机不位于机身内，而是置于佩戴者的耳道内。 一根由细导管包裹绝缘的细导线连接耳机与助听器机身。
This refers to the use of a BTE hearing aid where the receiver (loudspeaker) is placed outside of the hearing aid case and inside the wearer's ear canal.
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