Citizen Men's AT4008-01E Perpetual Chrono A-T Watch Atomic timekeeping, the most accurate watch in the world Stainless steel case with black rubber strap, 42mm case Non reflective sapphire glass 1 second chronograph measures up to 60 minutes, perpetual calendar, radio controlled in 5 time zones, alarm, 12/24 hour time, power reserve indicator Water resistant to 660 feet (200 M): suitable for recreational scuba diving