This document is a user manual for a CASIO watch, which describes the functions and usage of the watch.
This manual explains the various functions of the Casio 5057 watch, including time/date setting, stopwatch, timer, alarm, and world‑time features. Each section describes how to operate the corresponding function and provides reference data for further details.
The guide also covers maintenance and safety, such as battery replacement, water‑resistance testing, and precautions to avoid damage or skin irritation. It advises using only the original battery and having the replacement performed by an authorized service center. This manual is written in Japanese.
| Water resistance | Yes |
|---|---|
| Battery type | Original battery recommended |
Battery replacement should be performed by an authorized service center, and only the original battery type should be used.
The central hand stops to save battery power when the watch is not in use or the battery is low.
Keep the watch away from high humidity, avoid exposure to water when the seal is compromised, and clean the strap regularly to prevent skin irritation.