This kind of earphone is comfortable to wear, which can effectively isolate external noise and make candidates listen to listening materials more attentively. The school will purchase FM headphones in a unified way to ensure that it will not buy the wrong equipment. The frequency modulation of band 4 English listening headphones should be FM 1, the frequency range of FM 1 is 50-86MHz, and FM 1 is the special frequency band for listening test.