The bezels of GST-B200X are made of lightweight yet very rigid carbon material for the ultimate in shock resistance. Highly scratch resistant clear sapphire glass is used for the crystal to enhance readability and appearance, and to provide both toughness and good looks. In addition, hefty urethane bands feature a sporty outer surface pattern that integrates well with the textured pattern of the bezels.

The case is made of fine resin that incorporates carbon fiber for light weight along with rigidity that is superior to that of resin alone.

Case / bezel material: Carbon / Stainless steel
Resin Band
Shock Resistant 
Neobrite 
Sapphire crystal with anti-reflective coating
Carbon Core Guard structure 
200-meter water resistance
Tough Solar (Solar powered)
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)
LED:White
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)
Size of case : 53.3 × 46.5 × 14.3 mm
Total weight : 83 g