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Citizen Eco-Drive technology with atomic timekeeping makes this the most accurate watch in the world. This perpetual calendar is radio-controlled in 5 time zones, boasts a 1-second chrono that measures up to 60 minutes, and power reserve. Shown in stainless steel with black ion plating and luminous accents under non-reflective sapphire crystal. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number E650.