Cycles through different functions (Time, Alarm, Stopwatch, Time Setting). S (Set/Lap):
To set your clock accurately:
From the normal time mode, press once to enter stopwatch mode. Press D to start counting. Press D again to stop or pause the counting. Nako Na-617a User Manual
Pro Tip from the manual: Do not use the Nako Na-617a near strong electromagnetic fields (microwaves, large motors) as this can affect sensor accuracy. Press D again to stop or pause the counting
Press the button again to make the Hours flash. Press START to advance the hour. Look out for the "A" (AM) or "P" (PM) indicator to ensure your time is set accurately for the correct half of the day. Press START to advance the hour
Press three times to enter the time-setting mode (the seconds will begin flashing).
Do not use coins or household items for calibration. Only use a certified calibration weight.