Timeless styling that effortlessly takes you from work to play. Luminous Hands and Markers, Mineral Crystal. 30 Meters water resistant and 5 year limited. For over 40 years, Citizen's proprietary Eco-Drive technology has served as the example of how the brand is dedicated to the world and making its environment a better place. A simple yet revolutionary concept, Eco-Drive harnesses the power of light from any natural or artificial light source and converts it into energy, eliminating the need for any battery.Using renewable energy to keep Citizen Eco-Drive watches running forever.