OPPO teased a new kind of phone at its latest developer conference: one with an extending, rollable OLED display. This device was reportedly showcased by an engineer from this OEM after the show. This employee asserts that the X 2021 is rated to withstand 5 years of active use, during which thousands of its new special move can be executed.
https://www.notebookcheck.net/A-working-OPPO-X-2021-unit-is-seen-in-the-wild-along-with-its-alleged-durability-rating.505507.0.html