This document is an operation guide for CASIO watches, providing instructions on how to use the watch, including charging and power-saving functions.
This manual introduces the Casio 2869/2870 watches, explaining basic operation, power‑saving features, and how to charge the battery by exposure to bright light. It also details the radio‑controlled timekeeping system that receives calibration signals from transmitters in Rugby, England and Mainflingen, Germany.
The guide walks you through setting the Home City, configuring Daylight Saving Time, using World Time, Time Recorder, alarms, stopwatch, and troubleshooting signal reception. Instructions for both automatic and manual signal receive are provided, along with tips for optimal reception and battery management.
| Battery charging method | Bright light exposure charges the battery |
|---|---|
| Power Saving default | On |
| Signal reception radius | Approximately 1,500 km |
| World Time city codes | Up to 30 cities (29 time zones) |
| Time Recorder capacity | 30 records |
| Stopwatch display range | 23 h 59 m 59.99 s |
| Alarm count | Four one‑time alarms and one snooze alarm |
The watch ships with Power Saving turned on by default.