Casio Ring Watch

Case size (L× W× H) 25.2 × 19.5 × 6.2 mm Weight 16 g Case and bezel material Stainless steel Water resistance Water Resistant Power supply and battery life Approx. battery life: 2 years on SR621SW Country of origin China World time Dual time Stopwatch 1/100-second stopwatch Measuring capacity: 00'00''00~59'59''99 Alarm/hourly time signal Time flash (daily and every hour on the hour) * The Time Flash light may not be visible when ambient lighting is bright. * Time Flash is intended for entertainment purposes. Light LED backlight May not be visible in bright light. Light color LED: White 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, month, date, day