This document is a user manual for CASIO calculators, which introduces the usage of Ch-9 for the 5098/5099 models and the content of other chapters.
This manual explains how to operate the Casio 5098/5099 solar‑powered watch, including button functions, charging the built‑in battery with light, setting the time and using the stopwatch (分計數) feature. It also covers the radio‑wave time‑calibration function and how to select the current location for automatic signal reception.
Additional sections describe power‑saving mode, how to adjust hand base positions, troubleshooting common issues such as low battery indicators, and detailed specifications of accuracy, power source and signal reception capabilities. This manual is written in Chinese.
| Accuracy (room temperature) | ±15 seconds per month (without calibration signal) |
|---|---|
| Stopwatch (分計數) range | Maximum 20 minutes |
| Power source | Solar cell with rechargeable battery |
Press the @ button, then select the city code (e.g., TOKYO, HONG KONG, or OFF) to set the location.
Hold the @ button for about 10 seconds until the hand moves to its reference position, then release.