Casio G-SHOCK Big Size series GD-X6900FB-7JF Mens [Japan Import] Imported 10 Year Battery, Shock Resistant, 200M Water Resistant, Alpha Gel (R) Auto LED (Super Illuminator) Backlight with Afterglow, Flash Alert, World Time 3 Multi-function alarms (2 one-time alarms and 1 snooze Alarm), Hourly time signal, 1/100 second stopwatch, Countdown Timer Full auto-calendar (pre-programmed until the year 2099), 12/24 hour formats, Button operation tone on/off, Accuracy: +/-15 seconds per month Battery: CR2032, Approx. battery life: 10 years, Module: 3420, Size of case / total weight: 57.5 x 53.9 x 20.4mm / 84g