This is a user manual for a watch, which introduces the functions and usage of the watch.
This manual covers all operating procedures for the Casio 4386 and 4388 watches. It describes how to set digital and analog time, enable daylight‑saving time, choose a residence city, and adjust 12/24‑hour formats.\n\nAdditional sections detail the world‑time display, countdown timer with auto‑repeat and progress beeps, stopwatch, five daily alarms, and the LED back‑light. The reference data section provides city‑code tables, GMT offsets and technical notes such as the automatic calendar and year‑range limits. This manual is written in Chinese.
| LED illumination | two LEDs |
|---|---|
| Lighting duration | 1 second or 3 seconds |
| Year setting range | 2000–2039 |
| Automatic calendar | adjusts month length and leap‑year dates automatically |