This 3rd generation Skyhawk A-T was the first to redefine atomic timekeeping with radio-controlled accuracy perfection combined with Eco-Drive technology. Radio signals are received both automatically and on-demand in North America, the United Kingdom, Europe and Japan. Offering world time in 43 cities, this boasts a 1/100 second chronograph measuring up to 24 hours, a 99-minute countdown timer, perpetual calendar power reserve, and 2 alarms. Additional details include a Greenwich mean time display, digital display light, rotating slide rule bezel, and non-reflective crystal. This bold timepiece is crafted in stainless steel with a black ion plated bezel and black dial on a 46mm case, and is 200 meter water resistant. Citizen Eco-Drive is fueled by light, any light, so it never needs a battery. Combined with atomic timekeeping, it is the most accurate watch in the world.