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Slim, lightweight, compact watches with octagonal bezels and a monochromatic look. The new GMAS2100 series downsizes the popular GA2100 to create a simple and slim design. The octagonal bezel, flat face, simple bar hour markers, and carbon core guard structure that are distinctive features of the GA2100 are now available in a compact configuration. The GMAS2100-1A sports a classic black colorway with rose gold accents.

Carbon Core Guard Structure
A new carbon core guard structure protects the module by enclosing it in a carbon case. The case is made of fine resin embedded with carbon fibers for outstanding strength and crack resistance.
    •    Mineral Glass
    •    Shock Resistant
    •    200-meter water resistance
    •    Case / bezel material: Carbon / Resin　
    •    Resin Band
    •    Double LED light
LED light for the face (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
LED backlight for the digital display (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
    •    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:
00'00''00~59'59''99 (for the first 60 minutes)
1:00'00''~23:59'59'' (after 60 minutes)
Measuring unit:
1/100 second (for the first 60 minutes)
1 second (after 60 minutes)
Measuring modes: Elapsed time, split time, 1st-2nd place times
    •    Countdown timer
Measuring unit: 1 second
Countdown range: 24 hours
Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments)
    •    5 daily alarms
    •    Hourly time signal
    •    Hand shift feature
    •    Full auto-calendar (to year 2099)
    •    12/24-hour format
    •    Button operation tone on/off
    •    Regular timekeeping
Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (day)
Digital: Hour, minute, second, pm, month, date
    •    Accuracy: ±15 seconds per month
    •    Approx. battery life: 3 years on SR726W × 2
    •    LED:White