Citizen Eco-Drive Chronograph Atomic AT8011-55ECitizen Eco Drive Chronograph Atomic AT8011 55E Men's Watch This is one of the hottest wears for the technocrat. The atomic concept took mere quartz driven timekeeping a step higher and the Eco Drive makes sure its fed without fail. Keeping the right time, date or year no more requires human intervention; the signals from atomic clocks (in five different time zones) are what the watch adjusts to. However, you can always set them manually if you want.