The Casio MCW100H-9A2 Chronograph Watch is a highly practical timepiece. Its chronograph function allows for independent stopwatch timekeeping, perfect for sports or anything that needs precise timing. A durable 100m water resistance and resin case also gives this watch an amazing sporting or swimming capability.- Resin Band, Bezel and Case - 51.8 x 49.3 x 13mm Case Size - Resin and Spherical Glass - 100 Meters Water Resistant - Stopwatch:• 1-second stopwatch• Measuring capacity: 29'59• Measuring modes: Elapsed time, split time, 1st-2nd place times- Power Supply And Battery Life: Approx. battery life: 3 years on SR920SW- Accuracy: ±20 seconds per monthOther Features:• Date display• Regular timekeeping:∙ Analogue: 3 hands (hour, minute, second), 3 dials (stopwatch minutes, stopwatch seconds, 24-hour)