Casio G-Shock alarm sport black wrist watch features a scratch resistant mineral cover & is water resistant up to 200m. Watch offers flash alerts with a buzzer that sounds for alarms, hourly time signal & a countdown timer. Diameter: 45 mm (case). Battery type: CR2016. Display type: Digital. Item shape: Round. Band color: Black, dial color: Blue. Band material: Resin. Calendar: Auto calendar. Measuring capacity: 00'00"00-59'59"99 (for the first 60 minutes), 1:00'00-23:59'59 (after 60 minutes). Measuring mode: Elapsed time, split time, 1st - 2nd place times. Accuracy: +/- 15 seconds per month. Approx. battery life: 2 years, measuring unit: 1 second. Size: 53.2mm x 50mm x 16.3mm. Special feature: Shock-resistant, EL backlight with afterglow, flash alert, 1/100 second stopwatch, measuring unit: 1/100 second, multi-function alarm. Hourly time signal, countdown start time setting range: 1 second to 24 hours. Casio G-Shock Men's digital countdown alarm sport wrist watch in black color has black resin band with neutral face for added flair and is pre-programmed until the year 2039.