What should I do if there is noise after the earphones turn on noise cancellation ?

Solution:

 After enabling noise cancellation , judge the exception by scene and handle it:
①If there are frequent noises in scenes such as slight shaking of the head or walking in the normal state, you can apply for after-sales treatment.
②If there is noise in scenes such as vigorous running and jumping or taking the subway, the noise cancellation earphones will encounter problems, not malfunctions.