This manual provides detailed instructions for using the Casio 5040 watch, including how to set the time, select the residence city, and switch between standard time and daylight‑saving time. It also describes the automatic time‑signal reception from up to 29 world‑time stations and how to calibrate the watch manually when reception fails.
The watch is powered by a solar cell and an internal rechargeable battery. The document explains battery charging, power‑saving modes, and what to do when the battery level becomes low, as well as safety precautions for handling the device. This manual is written in Japanese.
| Power source | Solar cell + rechargeable battery |
|---|---|
| Battery life (full charge) | ≈5 months of operation |
| Accuracy (room temperature) | ±15 seconds per month |