There are two buttons on the right side of the Xiaomi Watch S3, with the function button on the top and the power button on the bottom.
Power on: In the shutdown state, Press and hold on the power button for 3 seconds to turn on the watch and enter the main page;
Shutdown: 1. When the watch is turned on, press and hold on the power button for 3 seconds to enter the page for restarting, shutting down, and restoring the factory. Choose it to shut down;
2. When turned on, tap on [Settings] >>[System Operations] >> [Select Shutdown] on the watch;
Restart: 1. When the watch is turned on, press and hold on the power button for 3 seconds to enter the restart, shutdown, and factory reset. Select [Restart];
2. When turned on, press and hold the power button for about 12 seconds, and the watch will forcibly restart;
3. When turned on, tap on [Settings] >> [System Operations] >> select [Restart] on the watch.