: Your watch is powered by light. For optimal performance, expose the dial to direct sunlight for 5–6 hours at least once a month. Avoid leaving it in dark places for long periods.
Before diving into the button sequences and crown adjustments, it is crucial to understand what makes the reference number unique. This model belongs to Citizen’s prestigious Eco-Drive line, meaning it is powered by light—any light. It never needs a battery replacement. citizen eco drive gn-4w-s-12g manual