Citizen's proprietary Eco-Drive technology draws energy from any light source, natural or artificial, and stores it to keep the watch running through periods in the dark. The result is a more sustainable approach to watchmaking and a watch that never needs a battery. The men's range spans dress watches, chronographs, and Promaster sports models, with options including radio-controlled accuracy, world time, and Super Titanium cases, each built for dependable everyday wear.