Earphone with binaural beats function

An earphone with binaural beats function, comprising:

• a left ear speaker, configured to provide a first sound wave to a left ear of a user;
• a right ear speaker, configured to provide a second sound wave to a right ear of the user;
• a wireless communicator;
• and
• a frequency adjuster, signally connected to the left ear speaker and the right ear speaker via a wire, and signally connected to the wireless communicator, wherein the frequency adjuster receives an external audio signal from the wireless communicator, the frequency adjuster adjusts the external audio signal to a first audio signal and then transmits the first audio signal to the left ear speaker, so that the left ear speaker emits the first sound wave, the frequency adjuster adjusts the external audio signal to a second audio signal and transmits the second audio signal to the right ear speaker, so that the right ear speaker emits the second sound wave, and a first frequency of the first sound wave and a second frequency of the second sound wave have a frequency difference,
• wherein the frequency difference comprises a plurality of switchable first frequency differences, and the first frequency differences automatically change cyclically in two or more ranges, the ranges chosen from the group of between 0.5 Hz and 4 Hz, between 4 Hz and 8 Hz, between 8 Hz and 12 Hz, between 12 Hz and 20 Hz, and between 25 Hz and 40 Hz.