Case / bezel material: Stainless steelOne-touch 3-fold ClaspStainless Steel BandMineral Glass / Spherical GlassScrew Lock Back100-meter water resistance1-second stopwatch Measuring capacity: 29'59 Measuring mode: Elapsed timeRegular timekeeping Analog: 3 hands (hour, minute, second), 3 dials (stopwatch seconds, 24-hour, stopwatch minutes)Accuracy: ±20 seconds per monthApprox. battery life: 2 years on SR621SW