Casio AQ-230GA-9B Details Case Size (L x W x H): 38.8 × 29.8 × 8.1 mm Weight: 47g Case and Bezel Material: Resin / Gold tone Band: Adjustable Clamp, Stainless Steel Band Water Resistance: Water Resistant Power and Battery Life: Approx. battery life: 3 years on SR920W Exterior Glass: Resin Glass Compatible Band Size: 140 to 205mm Watch Features World Time: Dual Time Stopwatch: 1/100-second stopwatch, Measuring capacity: 59'59.99'', Measuring mode: Elapsed time Alarm/Hourly Time Signal: Daily Alarm, Hourly Time Signal Calendar: Auto-calendar (28 days for February) Accuracy: Accuracy: ±30 seconds per month Other Features: 12/24-hour format, Regular timekeeping: Analog: 2 hands (hour, minute) Digital: Hour, minute, second, pm, month, date, day