Long clamping on on the left earpiece (it seems that on the right it turns on the maximum level of noise reduction, I didn’t see this in the application, I came by experience, so to speak With its pros: Long work (2.5 days without charging for 4-5 hours a day), excellent noise reduction Has some cons: On a bright (exactly bright, I saw that the color is not black but dark blue) application in Chinese (although I only went into it once to set up the assignments of the touch buttons)