In other respects, Redmi K40 is equipped with the flagship configuration of Snapdragon 870+LPDDR5+UFS3.1, built-in dual speakers and X-axis linear motor, 33W fast charge +4500mAh battery, it is a mid-range model with a balanced and top configuration. At the same time, this screen also supports the industry's highest peak brightness of 1500nit, supports HDR10+ and native 10bit display, JNCD≈0.38, obtained DisplayMate A+ rating, and supports full DC dimming. At the same time, OnePlus 9 Pro also dared to try a variety of CMF processes. The three color schemes have their own different visual and feel. It can be called a high-end flagship with excellent appearance, screen and image performance. S21 Ultra has improved the slot that cannot be turned on at the same time as 2K and 120Hz of the previous generation, and it is currently the only screen that can have both LTPO and 1500nit peak brightness. A little regret is that it only supports 8bit display. In addition, S21 Ultra also has a highly recognizable appearance design, a powerful imaging system and characteristic S-Pen interaction. It can be said that in addition to the well-known fast charging, it has a well-deserved performance of the machine king.