Case / bezel material: Stainless steel Resin Band Mineral Glass Screw Lock Back 50-meter water resistance 1-second stopwatch Measuring capacity: 29'59 Measuring mode: Elapsed time Regular timekeeping Analog: 3 hands (hour, minute, second), 3 dials (24-hour, stopwatch minutes, stopwatch seconds) Accuracy: ±20 seconds per month Approx. battery life: 2 years on SR621SW Size of case : 51.5×44×10.9mm Total weight : 91g