G-Shock/Casio GS-F105W1AQ Details Case Size (L x W x H): 39 × 35.4 × 9.6 mm Weight: 21 g Case and Bezel Material: Resin Band: Resin Band Water Resistance: Water Resistant Power Supply and Battery Life: Approx. battery life: 7 years on CR2016 Exterior Glass: Resin Glass 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: Electro-luminescent backlight Light Colour: EL - Blue Green Calendar: Auto-calendar (28 days for February) Accuracy: Accuracy: ±30 seconds per month Other Features: 12/24-hour format, Regular timekeeping - Digital: Hour, minute, second, pm, date, day