The Redmi K40 Gaming will be powered by the Dimensity 1200 when it launches next week. Despite being part of an already established range, it will be essentially a new phone with new cameras, design and other hardware features.
One of them is the shoulder keys for games, which will appear from the side once a slider is pulled. Here is a video edited by Redmi, which explains how this works.
The brand says that the keys are so good to click that they can even be used as fidget toys when the user is not playing. It provides clear sound every time they are pressed and closed with a magnet, providing much better feedback than existing solutions.
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According to the post on Weibo, the shoulders are extremely durable and have been clicked 1.5 million times without error. Thanks to the close-ups in the video, we can also see that the frame will be metallic, as well as the real shoulders, while the back panel seems to be made of glass, which would allow fast wireless charging.
Source (in Chinese)