It's a Mi MIX 2S
As early as the beginning of 2018, Xiaomi MIX 2S supported 7.5W wireless charging for the first time, and was the first mobile phone to support wireless charging in China, when only Apple and Samsung's flagship models supported wireless charging. Then, the Xiaomi MIX 3 released in October 2018 further upgraded the wireless charging power to 10W.
The Xiaomi 9 released in early 2019 not only supports 27W wired charging, but more importantly, it is equipped with the fastest 20W wireless charging at that time, far exceeding the wireless charging power of 5W and 7.5W in the same period, and it has passed the Qi EPP certification of the WPC Wireless Charging Alliance.