"Analog/Digital Display 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 Module 2327 *Though this watch is designed to withstand exposure to magnetic force, you should still keep it away from machinery and appliances that generate a strong magnetic field. Exposure to stong magnetism can cause timekeeping to slow, affecting timekeeping accuracy Size of case/total weight49.6 x 47.8 x 15.7mm / 59g (Approximately 1 13/16"" Wide by 1/2"" Thick)"