If the watch does not work, the seconds hand does not return to one-second movement even if the battery is sufficiently charged, or the watch operates irregularly, performing a system reset will return the watch to normal.
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Unlock the crown and button.
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Pull out the crown.
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Hold down Button
and Button 
at the same time for more than 10 seconds -
Set the standard hand position and time/date.
The digital display will turn off, and the system will reset. When you let go of the buttons, time and date setup will appear on the digital display.
The time and date will be shown as 1/1/2019, Tuesday, 12:00:00 am.
