Eco-Drive timepiece featuring Atomic Clock synchronization, one-second chronograph measuring up to 60 minutes, perpetual calendar, 12- and 24-hour times, alarm, power reserve indicator, luminosity, and day/date functionality 42 mm stainless steel case with antireflective sapphire dial window Japanese quartz movement with analog display. Band- Black Stainless Steel Bracelet, fold-over clasp with double push-button Water resistant to 200 m (660 ft): In general, suitable for professional marine activity and serious surface water sports, but not scuba diving. Citizen Eco-Drive technology powered by any light 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 black ion plating with blue & luminous accents under non-reflective sapphire crystal.