EF540D-1A

Case / bezel material: Stainless steelSolid BandDouble-lock, 1-press, 3-fold ClaspStainless Steel BandMineral GlassTachymeterScrew Lock BackPartial ion plated100-meter water resistance1-second stopwatch Measuring capacity: 59'59 Measuring mode: Elapsed timeDate displayRegular timekeeping Analog: 3 hands (hour, minute, stopwatch seconds), 3 dials (timekeeping second, 24-hour, stopwatch minutes)Accuracy: ±20 seconds per monthApprox. battery life: 2 years on SR927W