Casio #F200W-2A Men's Chronograph Alarm Illuminator Watch Made in USA or Imported Water Resistant, Illuminator Light, Daily Alarm 1/100 second digital stopwatch, Hourly Time Signal Auto Calendar, Accuracy: +/-30 seconds per month Battery CR2016, Approx. battery life: 10 years Module 2518, Case Size: 40mm Diameter, 11mm Thickness