Model DL-850 FM Three-Band Wireless earphone, It has functions to receive both AF and FM signals and can be used to accept hearing training instead of wire earphone in phonetic room.
DL - 850型调频三波段无线耳机不仅具有音频感应接收功能，还具有接收调频信号功能，该型号无线耳机还可以代替语音室有线耳机进行听力训练。
This system can be used in the library, several email reading room, phonetic reading, multimedia room and so on.
它可用于图书馆的管理系统、几个电子阅览室、语音室、多媒体教室等。
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