A deeper understanding of Xadow Watch:
A wired jumper you should pay attention to. There are two times within RTC module, but only one of them will be shown on the back of board: INTB. The main logic is: RTC and button will sent INT to MCU, and OLED changes according to the interruption. So connect the INT to the RX on Xadow compatible interface.
To make it simple and wear more comfortable, I cut off a short segment of cowhide.
Just use a little clip, it's on your hand now!