"Shock Resistant 100M Water Resistant LED Light with Afterglow Multi-function Alarm Countdown Timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 second to 24 hours (1-second increments and 1-hour increments) Other: Auto-repeat function 1/100 second stopwatch Measuring capacity: 00'00""00-59'59""99 (for the first 60 minutes)1:00'00-23:59'59 (after 60 minutes) Measuring unit: 1/100 second (for the first 60 minutes)1 second (after 60 minutes) Measuring modes: Elapsed time, split time, 1st-2nd place times Hourly Time Signal Auto Calendar (pre-programmed until the year 2039) 12/24 Hour Formats Accuracy: +/-30 seconds per month Battery: CR1616 Approximate Battery Life: 2 years Module 2902 Size of case/total weight: 34.5 x 35.4 x 13.1mm / 36g"