Casio Mens Classic G-Shock Digital Watch, with Shock Resistant, Quartz Digital Movement, and Multi-Function Alarm, Stopwatch, and Countdown Timer, Features Hourly Time Signal, Auto Calendar, and 12- and 24-Hour Formats, Backlight with Afterglow, Water-Resistant to 200 M (660 Feet) High-tech functions, shock resistance, and comfortable resin strap, this Casio watch is a reliable go-to timepiece Quartz digital movement with accuracy of +/- 15 seconds per month Functions include multi-function alarm, 1/100-second stopwatch, countdown timer, hourly time signal, auto calendar, and 12- and 24-hour formats Stop Watch Measuring mode: elapsed time, split time, 1st-2nd place times Protective mineral dial window, Water-resistant to 200 m (660 feet), will stand up to the rigors of recreational scuba diving