This document provides instructions and precautions for using CASIO watches, including information on charging the watch, the requirements for exposure to light, and the power-saving function for the hands.
This manual explains how to use the Casio 4390MO0901-ChA solar‑powered watch. It emphasizes keeping the watch exposed to bright light so the built‑in solar cell can charge the dedicated rechargeable battery.\n\nThe guide covers setting the time, world‑time functions, radio‑controlled synchronization, hand calibration, and maintenance procedures, as well as safety and warranty information. This manual is written in Chinese.
| Battery type | Dedicated rechargeable secondary battery (non‑removable) |
|---|---|
| Power source | Solar cell charging via exposure to bright light |
Keep the watch exposed to bright light as much as possible to allow the solar cell to charge the battery.
No. The user must not remove the dedicated rechargeable battery; it requires service by an authorized center.