Frequency Response: Depend on the different mechanism design, we can choose the high leaking type curve or low leaking type curve.
Sensitivity (S.P.L)
Impedance: The receiver with 16, 32, 64, or 150 ohm is often used. The higher the impedance is the more electricity we can save.
Total Harmonics Distortion: The total harmonics distortion includes first time, second time, etc.
Magnet Field Intensity: when the receiver is use for hearing aid function, the magnet field intensity will be marked.

Frequency Response. 依曲線的不同,分為高洩漏式,低洩漏式的,需與機構設計配合.
Sensitivity (S.P.L)
Impedance. 常用16,32,64,150ohm的, 阻抗愈高愈省電
Total Harmonics Distortion 總諧波失真(THD),包含一次二次…等的總和諧波失真.
Magnet Field Intensity 當受話器有加助聽功能時,會標示磁場密度.