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。