Product DescriptionCitizen 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. Silver-tone stainless steel bracelet and black ion plated case, 42mm. Black dial features luminous hands and hour markers, three subdials, date window and logo. Eco-Drive E650, Atomic Timekeeping movement. Water resistant to 200 meters.