Oppo Watch 4 Pro is set to be launched in the Chinese market by the end of this month. The smartwatch could debut alongside Oppo Find N3 Flip foldable smartphone in China on August 29. Ahead of its debut, the watch has been teased by the company on Weibo, revealing some of the key specifications of the wearable. The Oppo Watch 4 Pro has been teased to offer a full-colour always-on display with an LTPO AMOLED panel….