This document describes the features and characteristics of the E870 model solar-powered watch, including time accuracy, temperature range, display functions, other features, and continuous operation time.
The Casio E870 is a solar‑powered wristwatch that converts light into electricity via an integrated solar cell. It offers a 24‑hour time display, minutes, seconds, calendar, month and year, with a perpetual calendar valid through February 28 2100.
The manual explains how to set the time, calendar, alarm and regional time, describes the charging‑warning and power‑saving functions, and provides a full reset procedure for restoring the watch after a battery or impact issue. This manual is written in Chinese.
| Time accuracy | ±15 seconds per month |
|---|---|
| Operating temperature range | -10 °C to +60 °C |
| Battery life (full charge) | ≈1.5 years with power‑saving, ≈7 months without |
| Alarm duration | 15 seconds |
A full charge lasts about 1.5 years with the power‑saving function enabled, or about 7 months without it.
When the battery is low, the seconds hand jumps two seconds at a time to signal the charging‑warning condition.