Basic Information a158wetb-1a Case Dimensions (H x W x D) 36.8 × 33.2 × 8.2 mm Weight 45 g Case and Bezel Material Resin / Black Chrome Band Stainless Steel Band Adjustable Clasp Water Resistance Waterproof Power and Battery Life Durability Approximate battery life: 7 years with CR2016 Exterior Glass Acrylic glass Surface treatment Gray band with ion plating Watch Features Stopwatch 1/100 second stopwatch Measuring capacity: 59'59.99" Measuring modes: net time, split time, time in 1st and 2nd place Sound Reminder / Time Signal Daily Sound Reminder Time Signal Light LED Light LED Light Color: Green Calendar Auto Calendar (set to 28 days for February) Accuracy Accuracy: ±30 seconds per month Other Features Format 12/24 hours Regular time display: hour, minute, second, pm, date, day of the month shipped with case and guarantee