This document is a user manual for Casio watch 5031 1 MO0905-A. The watch features a solar-powered battery and receives time calibration radio waves. The watch needs to be exposed to bright light regularly to keep the battery charged. The watch can automatically or manually adjust the time and can also manually receive time calibration radio waves. The watch has a power-saving function to extend battery life.
This manual explains how to use the Casio 5031 1MO0905-A solar‑powered watch. It covers pre‑use precautions, charging the built‑in solar cell, and the watch’s power‑saving functions.
Detailed sections describe how to set the home city, configure world‑time zones, operate the stopwatch, and perform automatic or manual pointer calibration. Troubleshooting tips for signal reception and low‑battery warnings are also provided. This manual is written in Chinese.
| Accuracy (no signal) | ±15 seconds per month |
|---|---|
| Power source | Solar cell + rechargeable battery |
| Battery life (no light) | ≈5 months |
| Stopwatch measurement limit | 23:59:59.95 |
| Stopwatch resolution | 1/20 second |
It indicates the battery power is very low (level 2). The watch must be exposed to light to recharge before it can receive time‑signal updates.
Check that the watch is placed in a bright location, away from metal objects, and try manual reception by holding A for two seconds, then follow the on‑screen prompts.