Strength in style. Citizen eco-driveâ® technology harnesses the power of any light source so it never needs a battery. Men's citizen eco-driveâ® black chronograph watch has quartz movement and is water resistant up to 100 meters. Features include a 50-day power reserve and an alarm. Watch has a black dial in a round case and a black leather strap, and this watch includes a five-year limited manufacturer warranty, with an additional one-year warranty upon registering your watch with citizen. We are an authorized citizen dealer.