An ultra-thin module encased in carbon fibre makes for a stylish G-STEEL timepiece with the slimmest profile yet.
Strong, yet lightweight, the carbon core guard structure absorbs external shocks and retains Bluetooth connectivity and solar power functionality even with smaller components and a thinner module. Measuring just 12.9mm from the back of the case to the top of the bezel, the GST-B400 is over a millimetre thinner than its predecessor .
Your choice of four distinctive styles-the simplicity of a silver metal band and silver case; light silver case set against dark resin band; dial in dramatic red vapour deposition finish paired with a black ion-plated bezel; or dial in bold blue vapour deposition finish with black ion-plated bezel and band. With top bezels treated with five different finishes and middle bezels treated with four, these G-STEEL timepieces deliver exceptional metal textures from every angle.
* Slimmest profile as of December 2020
2 year warranty
Band
Resin Band
Case and bezel material
Resin / Stainless steel
Case size (L× W× H)
Case dimensions (length x width x height) shown here are standard values and may differ from actual product dimensions. Use the case dimensions provided here as general reference values.
* Dimensions show the measurements indicated in the illustration above.
46.6 × 49.6 × 12.9 mm
Construction
Shock Resistant
Carbon Core Guard structure
Power supply and battery life
Tough Solar (Solar powered)
Water resistance
200-metre water resistance
Weight
80 g
Compatible band size
145 to 215 mm
Glass
Mineral Glass
Other
Neobrite
App connectivity feature
Auto time adjustment
Easy watch setting
Approximately 300 world time cities
Time & place
Reminder
Phone finder
Apps
CASIO WATCHES
Smartphone link feature
Mobile link (Wireless linking using Bluetooth®)
Accuracy
Accuracy: ±15 seconds per month (with no mobile link function)
Alarm/hourly time signal
5 daily alarms
Hourly time signal
Battery display alert
Battery level indicator
Calendar
Full auto-calendar (to year 2099)
Energy saving feature
Power Saving (display goes blank to save power when the watch is left in the dark)
Light
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)
Mute feature
Button operation tone on/off
Other features
12/24-hour format
Date/month display swapping
Day display (days of the week selectable in six languages)
Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents.)
Regular timekeeping:
Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (battery level, mode)
Digital: Hour, minute, second, pm, month, date, day
Run time
Approx. battery operating time:
7 months on rechargeable battery (operation period with normal use without exposure to light after charge)
18 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
Stopwatch
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, lap/split time
Timer
Countdown timer
Measuring unit: 1 second
Countdown range: 60 minutes
Countdown start time setting range: 1 second to 60 minutes (1-second increments and 1-minute increments)
World time
World time
38 time zones (38 cities + coordinated universal time), city code display, city name display, daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping