Citizen Mens Eco-Drive Calendrier Watch - Black Metal -Black Dial -Mesh BraceletSophisticated style designed to keep pace in any time zone. The Citizen Calendrier series features a rotating inner dial ring with world time in 24 time zones, 12 24 hour time, and day date. Powered by Eco Drive technology that is powered by any light, never requiring a battery change. Ever. Citizen Eco Drive solar powered movement (never needs a battery change) Black ion plated stainless steel case Black dial with silver tone hands and markers