Eco-Drive | Purposeful Power The sustainable way to power your watch—no batteries required. Citizen's proprietary Eco-Drive technology powers your watch using the most renewable energy: light. | Light to Energy Uses a renewable natural resource by converting any natural or artificial light to energy, which is then stored in a permanently rechargeable lithium-ion cell. | Energy Storage Keeps surplus energy in a rechargeable power cell. Designed to charge not just from the sun, but also from everyday light sources like indoor fluorescents and desk lamps. | Recharges Continuously Runs for months—even in darkness—with no need for regular battery replacement, so your watch can run forever and you never have to worry about it stopping. |