Three new color variations of the Tough Solar GAS-100 add new flavor to this case design. Variations on a basic black design are created by three different bezels. The GAS- 100 comes with a stainless steel bezel for a standard design that goes well with a wide range of fashion styles, while the GAS-100G has a stainless steel bezel with a gold ion-plated finish for touch of distinctive beauty. The GAS-100B has a black aluminum bezel for a cool design. A CASIO original molding process is used to produce deposition coated hour markers that combine with the metal bezels to create a look of elegance.
 
Shock resistant
200m water resistance
Solar powered
Double LED light
LED light for the face (Full auto LED light, Super illuminator, selectable
illumination duration, afterglow)
LED backlight for the digital display (Full auto LED light, Super illuminator,
selectable illumination duration, afterglow)
World time
31 time zones (48 cities + coordinated universal time), daylight saving on/off
1/100-second stopwatch
Measuring capacity: 59'59.99''
Measuring modes: Elapsed time, split time, 1st-2nd place times
Countdown timer
Measuring unit: 1 second
Countdown range: 100 minutes
Countdown start time setting range: 1 second to 100 minutes (1-second
increments, 1-minute increments)
5 daily alarms
Hourly time signal
Hand shift feature (Hands move out of the way to provide an unobstructed view
of digital display contents.)
Battery level indicator
Power Saving (display goes blank to save power when the watch is left in the
dark)
Full auto-calendar (to year 2099)
12/24-hour format
Button operation tone on/off
Regular timekeeping
Analog: 2 hands (hour, minute)
Digital: Hour, minute, second, pm, date, day
Accuracy: ±15 seconds per month
Approx. battery operating time:
8 months on rechargeable battery (operation period with normal use without
exposure to light after charge)
19 months on rechargeable battery (operation period when stored in total
darkness with the power save function on after full charge)
Module: 5445
Size of case / total weight
GAS-100B ...........55.1 52.5 16.7 mm / 72 g