Classic Casio styling. Black resin case & band. Time-tested quality and reliability, water resistance, and accuracy to +/- 30 seconds per month. Choose between 12- and 24-hour time format. Blue electroluminescent microlight for viewing in low light. Daily alarm feature, hourly signal, and autocalendar. Stopwatch measures 1/100 seconds in net time, split time, and 1st-2nd place times modes. Approximate battery life is 7 years.