Casio analog-digital resin Gshock. Shock Resistant 200M Water Resistant Magnetic Resistant EL Backlight with Afterglow Dual Time Daily Alarm 1/100 Second Stopwatch Measuring capacity: 23:59'59.99" Measuring unit: 1/100 second (for the first 60 minutes) 1 second (after 60 minutes) Measuring mode: Elapsed time Auto Calendar (pre-programmed until the year 2039) 12/24 Hour Formats Accuracy /- 15 seconds per month Battery CR2016 Approx. battery life: 3 years