GD100-1B

Case / bezel material: ResinResin BandShock ResistantMineral Glass200-meter water resistanceLED Backlight Auto light switch, selectable illumination duration, afterglow.Flash alert Flashes with buzzer that sounds for alarms, hourly time signal, countdown timer time up alarmMulti time (4 different cities)World time 31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city / World time city swapping1/100-second stopwatch Measuring capacity: 23:59'59.99'' Measuring modes: Elapsed time, split time, 1st-2nd place timesCountdown timer Measuring unit: 1/10 second Input range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments)5 alarms (daily or one-time)Hourly time signalFull auto-calendar (to year 2099)12/24-hour formatButton operation tone on/offRegular timekeeping: Hour, minute, second, pm, month, date, dayAccuracy: ±15 seconds per monthApprox. battery life: 7 years on CR2025