Citizen Men's AT8030-18F Eco-Drive Limited Edition World Chronograph A-T Watch Eco-drive is fueled by light so it never needs a battery Atomic timekeeping, the most accurate watch in the world Automatic time in 26 world cities and radio-controlled in North America, United Kingdom, Europe, Japan and China Sapphire crystal Water resistant to 660 feet (200 M): suitable for recreational scuba diving