• Shock Resistant
• Carbon Core Guard structure
• Mineral Glass
• Neobrite
• 200-meter water resistance
• Case / bezel material: Carbon / Stainless steel
• Resin Band
• Double LED light
• LED light for the face (Full auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
• LED backlight for the digital display (Full auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
• Tough Solar (Solar powered)
• Mobile link (Wireless linking using Bluetooth®)
• World time
• 39 time zones* (39 cities + coordinated universal time), daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping
• *May be updated when connected to a smartphone.
• 1/1000-second stopwatch
• Measuring capacity:
• 00'00''000~59'59''999 (for the first 60 minutes)
• 1:00'00''0~23:59'59''9 (after 60 minutes)
• Measuring unit:
• 1/1000 second (for the first 60 minutes)
• 1/10 second (after 60 minutes)
• Measuring modes: Elapsed time, split time
• Countdown timer
• Measuring unit: 1/10 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 multi-function alarms (with daily, 1 time, schedule)
• Hourly time signal
• Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents.)
• Battery level indicator
• Full auto-calendar (to year 2099)
• 12/24-hour format
• Button operation tone on/off
• Power Saving (display goes blank and hands stop to save power when the watch is left in the dark)
• Regular timekeeping
• Analog: 3 hands (hour, minute (hand moves every 10 seconds), second)
• Digital: Hour, minute, second, pm, month, date, day
• Accuracy: ±15 seconds per month (with no mobile link function)
• Approx. battery operating time:
• 6 months on rechargeable battery (operation period with normal use without exposure to light after charge)
• 20 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
• LED:White
• Module: 5608
• Size of case: 53.3×49.2×14.5mm
• Total weight: 177g

Carbon Core Guard Structure. The case is made of fine resin that incorporates carbon fiber for light weight along with rigidity that is superior to that of resin. This material protects the internal module from shock-induced damage and deformation. The dual back cover protects the back surface against impact. The small case of the GST-B100 series base model provides a comfortable fit, even though the watch is equipped with a wide face. The light-on-dark LCD contributes to both functionality and face design.