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.

• Case / bezel material: Carbon / Resin
• Resin Band
• Mineral Glass
• Neobrite
• Shock Resistant
• Carbon Core Guard structure
• 200-meter water resistance
• 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
• 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
• Size of case : 46.2×42.9×11.2mm
• Total weight : 41g