Air conducting receiver (speaker):空气传导接收器(扬声器)
Microphone(s) - Two or more used for directional processing to reduce background noise
:两个以上麦克风用于定向处理以减少背景噪声
Mechanical potentiometer for program volume control:机械式电位器用于程序音量控制
Mechanical switch for program switching:机械式开关用于程序切换
Disposable or rechargeable battery (2 V-0.9 V):一次性或可充电电池(2 V-0.9 V)
Telecoil – converts electromagnetic fields to electrical energy (phones):拾音线圈-将电磁场转化为电能(电话)