OPPO launched a first-gen premium smartwatch in 2020, then followed it up shortly afterward with a version certified to generate on-wrist electrocardiograms. This spec allowed the device to compete with the latest Apple Watches of the time. Now, a famous leaker asserts that an edition of the OPPO Watch 2 with the same ability is coming up.
https://www.notebookcheck.net/OPPO-will-launch-a-Watch-2-ECG-Edition-soon.562242.0.html