This manual is for 3319/3781 watch. It introduces the operation of each function of the watch, including digital time and date, summer time, local city code, 12/24 hour time system, and illumination duration.
This manual provides step‑by‑step instructions for all operating modes of the Casio 3319/3781 watch, including timing, world‑time, countdown timer, stopwatch, alarm and hand‑setting modes. Each mode description shows which buttons to press and how to navigate the settings.
It also covers auxiliary functions such as daylight‑saving time (DST) adjustment, local city‑code selection, automatic and manual illumination, illumination duration, and safety warnings for the EL display. Reference tables for city codes and GMT offsets are included at the end of the document. This manual is written in Chinese.
| Display illumination type | EL (electroluminescent) panel |
|---|---|
| Year setting range | 2000–2039 |
| Automatic calendar | Adjusts month length and leap year automatically |
Press the C button twice to select the local city‑code setting, then use the B and D buttons to choose the desired code.