Personally, I like Lezhibang's brand very much, but Lezhibang's product design is really not enough to take into account the user experience. MU2 adopts the common linear connection method on the market, because the AMP module is hung outside the pocket due to its large size. The wire is easily bent inside the pocket, the button is easily touched by mistake, and the button has the same texture. Blind operation is almost impossible. The way the module is hung outside the pocket is relatively shaking, so a back clip-type improvement scheme is designed.