G-Shock GD100GB Watch - G-Shock GD100GB Series watch by Casio. Shock resistant. 200M water resistant. Low temperature resistant LCD (-20 C / -4 F). Auto EL backlight with afterglow. Flash alert. Tide graph (tide level for specific date and time). Moon data (moon age of the input data, moon phase graph). World time. 29 times zones (48 cities). Four multi-function alarms and one snooze alarm. Hourly time signal. Auto Calendar (pre-programmed until the year 2099). 12/24 hour formats. Accuracy: +/- 15 seconds per month. Imported.