Water Resistant Micro Light Daily Alarm 1/100 second digital stopwatch,Measuring capacity: 59’59.99” tMeasuring modes: Net time, split time, 1st-2nd place times Hourly Time Signal Auto Calendar 12/24 Hour Formats Accuracy: +/-30 seconds per month Battery CR2016 Approx. battery life: 7 years Size of case: 38.2 x 35.2 x 8.5mm Total weight: 22g