Citizen Skyhawk watch collection. Citizen Skyhawk watches are part of citizen eco-drive series. These watch models are solar power which means they never require battery replacement. Some features of citizen skyhawk series are 4 Year Power Reserve. Charging in sunlight or indoors. World time. 3 world time alarms. 1/100 second chronograph. One touch interchangeable Analog / digital times. Alarm & self-Adjusting Calendar 99 minutes countdown timer. Dual time. Rotating Side rule bezel. Click on any of the models below for more information.