[Xiaomi releases the first "mid-folding" mobile phone Xiaomi 18 Fold] On September 7, Xiaomi released the folding screen mobile phone Xiaomi 18 Fold and defined it as a "mid-folding" product between large folding and small folding. Lei Jun, chairman and CEO of Xiaomi Group, said that the product project was initiated two years ago and took 20 months to develop. It is currently Xiaomi's most high-end mobile phone product. In terms of screen, Xiaomi Mi 18 Fold is equipped with a 5.38-inch external screen and a 7.58-inch internal screen. The aspect ratio of the internal and external screens is approximately √2:1, which is close to the A-series paper ratio. Xiaomi said that both screens use "super pixel" technology to improve display clarity and reduce power consumption. In terms of body, Xiaomi Mi 18 Fold has a thickness of 5.02 mm when unfolded on one side and 10.68 mm when folded. The whole machine weighs 219 grams.