The initial calibration and pairing process is critical. Follow these steps exactly as written in the official Yayusi S2 user manual.

Open Bluetooth settings on your phone or tablet and select or " " to connect.

The Yayusi S2 replied: “Then do that. I’ll keep time.”

: Reviewers note that while the device is feature-rich (including a mirror finish and temperature display), the buttons can be "stiff," and the multi-press logic for different modes requires the manual for initial setup.