Shock Resistant 200 Meter Water Resistant EL Backlight with Afterglow Flash Alert Flashes with buzzer that sounds for alarms, hourly time signal, countdown timer time-up alarm 1/100 second stopwatch 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 Countdown timer Measuring unit:1 second Countdown range: 24 hours Countdown start time setting range:1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments) Other: Auto-repeat Multi-function alarm Hourly time signal Full auto-calendar (pre-programmed until the year 2099) 12/24 hour formats Accuracy: +/- 15 seconds per month Battery: CR2016 Approx. battery life: 2 years Module: 3229 DW5600BB 48.9 x 42.8 x 13.4mm / 60g Style: DW5600BB1