• Shock resistant (G-SHOCK) • Electro-luminescent backlight Auto light switch, dual illuminator, afterglow • Flash alert Flashes with buzzer that sounds for alarms, hourly time signal, countdown timer time up alarm, countdown timer progress beeper, and stopwatch auto start • World time 29 time zones (48 cities), city code display, daylight saving on/off • 1/100-second stopwatch Measuring capacity: 23:59'59.99'' Measuring modes: Elapsed time, split time, 1st-2nd place times Other: 5-second countdown auto start • Countdown timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments) Others: Auto-repeat, progress beeper • Multi-function alarms 3 independent multi-function alarms (2 one-time alarms and 1 snooze alarm) • Hourly time signal • Full auto-calendar (to year 2099) • 12/24-hour format • Button operation tone on/off • Regular timekeeping: Hour, minute, second, pm, month, date, day • Accuracy: ±15 seconds per month • Approx. battery life: 5 years on CR2016 • Size of case / total weight 43.6 X 39.8 X 13.9 mm / 59 g