Product Description Brand: Casio water resistant Stop Watch. LED lighting Case/bezel material: resin Resin bracelet resin glass. water resistant LED lighting 1/100 second stopwatch. Measuring capacity: 59'59.99" Measuring modes: net time, time difference, 1st-2nd place timing Daily alarm signal at the passage of each hour. Auto-calendar (28 days for February) Hour format - 12/24 Standard time setting: hour, minute, second, pm, date, day Accuracy: +/- 30 seconds per month. Approximate battery life: 7 years for CR2016 Case size: 38.2 x 35.2 x 8.5 mm Total weight: 21 grams