Casio Men's Stainlesss Steel Analog Digital Watch Model AW-E10D-1EV 50M Water Resistant, EL Backlight with Afterglow Dual Time, Daily Alarm, 1/100 second digital stopwatch Hourly Time Signal, Auto Calendar, 12/24 Hour Formats Accuracy: +/-30 seconds per month, Battery SR920W, Approx. battery life: 2 years Module 2705, Size of case / total weight: 43.5 x 35.5 x 7.0mm / 39g