Casio G-Shock GD-100-1A Digital Sports

Specifications
Case / bezel material: Resin
Resin Band
Shock Resistant
Mineral Glass
200-meter water resistance
LED Backlight
Auto light switch, selectable illumination duration, afterglow.
Flash alert
Flashes with buzzer that sounds for alarms, hourly time signal, countdown timer time up alarm
Multi time (4 different cities)
World time
31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city / World time city swapping
1/100-second stopwatch
Measuring capacity: 23:59'59.99''
Measuring modes: Elapsed time, split time, 1st-2nd place times
Countdown 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 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: 7 years on CR2025
Size of case / Total weight
Size of case : 55×51.2×17.4mm
Total weight : 72g