G-Shock/Casio GS-A158WEA9 Details Case Size (L x W x H): 36.8 × 33.2 × 8.5 mm Weight: 45 g Case and Bezel Material: Resin Band: Stainless Steel Band, Adjustable Clasp Water Resistance: Water Resistant Power Supply and Battery Life: Approx. battery life: 7 years on CR2016 Exterior Glass: Resin Glass Compatible Band Size: 150 to 205 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 light Light Colour: LED Green 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