This document describes the features and usage of a solar-powered watch, including time calibration, calendar calibration, dual time zone function, and world time function.
This manual covers the basic operation of the Citizen CTZ-BB109 Eco‑Drive watch, including how to set the time, date, and other functions. It also explains the watch’s Eco‑Drive technology and battery‑free operation.
Additional sections provide technical specifications, environmental limits, and maintenance guidelines to help users keep the watch running accurately over its lifetime.