G-Shock/Casio GS-W218H3BV Details Case Size (L x W x H): 44.4 × 43.2 × 10.8 mm Weight: 37 g Case and Bezel Material: Resin Band: Resin Band Water Resistance: 50-meter water resistance Power Supply and Battery Life: Approx. battery life: 7 years on CR2016 Country of Origin: China Exterior Glass: Resin Glass Compatible Band Size: 145 to 215 mm Watch Features Stopwatch: 1/100-second stopwatch, Measuring capacity: 59'59.99", Measuring modes: Elapsed time, split time, 1st-2nd place times Alarm / Hourly Time Signal: Daily alarm, Hourly time signal Light: LED backlight Light Colour: LED Amber Calendar: Auto-calendar (set at 28 days for February) Accuracy: Accuracy: ±30 seconds per month Other Features: 12/24-hour format, Regular timekeeping - Hour, minute, second, pm, date, day