My mouse is broken, too. After you toggle the wheel, the direction of the mouse scrolling on the screen is uncertain, sometimes it is the same as the direction you toggle the wheel, sometimes it is the opposite, and sometimes it does not move. But many times, it is not sensitive. Originally, I thought miniso's things were cheap and good, and there were many kinds. Now it is found that most things are of poor quality. Not as cheap as Taobao.