The Apple Watch comes with a circular Digital Crown that helps users navigate through menus, zoom in or out on images, and perform other functions as well. However, the OPPO smartwatch won't sport the crown hardware.
Instead, there will be two physical buttons placed on the right side of the case that may be used for various navigational and control functions.
Some of the official teasers also highlight that the upcoming OPPO wearable will also support calling functions. Hence, it is safe to presume that it will have e-SIM capability to help users make and receive calls right from the device.