G-SHOCK, the indestructible watch brand, presents a model with an ultra-thin module enclosed in carbon fiber. Rugged yet lightweight, the carbon core protective structure absorbs external shocks and maintains Bluetooth connectivity and solar power functionality even with smaller components and a thinner module. The GST-B400 measures just 12.9mm from the back of the case to the top of the bezel and is more than a millimeter thinner than its predecessor. Choose from four different styles: the simplicity of a metal strap and silver case; the light silver case paired with a dark resin strap; the red vapor finish dial paired with a black ion-plated bezel; or the bold blue vapor-finish dial with black ion-plated bezel and strap.
Case dimensions (H x W x D)
46.6 × 49.6 × 12.9 mm
Weight
80 g
Case and bezel material
Resin/Stainless steel
Strap
Stainless steel strap resin
Structure
Shock resistant
Carbon Core Guard structure
Waterproof
Waterproof up to 20 bar
Power and battery life
Tough Solar (solar powered)
Smartphone connection function
Mobile Link (wireless connection via Bluetooth®)
App
CASIO WATCHES
Glass
Mineral glass
Miscellaneous
Neobrite
World time
World time
38 time zones (38 cities + Coordinated Universal Time), city code display, city name display, daylight saving time on/off, automatic daylight saving time (DST) switching, home city switching time zone/world time
Stopwatch
Hundredths of a second stopwatch
Measuring Capability:
00’00”00~59’59”99 (for the first 60 minutes)
1:00’00~23:59’59 (after 60 minutes)
Unit of measurement:
1 hundredth of a second (for the first 60 minutes)
1 second (after 60 minutes)
Measurement mode: elapsed time, split/lap time
Timer
Countdown timer
Unit of measurement: 1 second
Countdown interval: 60 minutes
Countdown start time setting range: 1 second to 60 minutes (1 second increments and 1 minute increments)
Sound Reminder / Time Signal
5 reminders daily sounds
Hourly signal
Light
Double LED light
LED light for the dial (Super Illuminator, selectable illumination duration (1.5 seconds or 3 seconds), luminescence)
LED backlight for the digital display (Super Illuminator, selectable illumination duration (1.5 seconds or 3 seconds), luminescence)
Light color
LED: white
< h2>Calendar
Full automatic calendar (up to the year 2099)
Mute the volume
Turn the pressure tone on/off buttons
Energy saving function
Energy saving (display turns off to save energy when the watch is left in the dark)
Status display/alert battery life
Battery level indicator
Ride timing
Approximate battery run time:
7 months with rechargeable battery (operation period for normal use without exposure to light after charging)
18 months with rechargeable battery (operating period when stored in total darkness with the energy saving function activated after a full charge)
Accuracy
Accuracy: ±15 seconds per month (without Mobile Link function)
Other features
12/24 hour format
Display switching date/month
Day display (days of the week selectable in six languages)
Hand movement function (the hands move so as not to block the display of the contents of the digital display).
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
GST-B400-1A
Case dimensions (H x W x D)
46.6 × 49.6 × 12.9 mm
Weight
80 g
Case and bezel material
Resin/Stainless steel
Strap
Stainless steel strap resin
Structure
Shock resistant
Carbon Core Guard structure
Waterproof
Waterproof up to 20 bar
Power and battery life
Tough Solar (solar powered)
Smartphone connection function
Mobile Link (wireless connection via Bluetooth®)
App
CASIO WATCHES
Glass
Mineral glass
Miscellaneous
Neobrite
World time
World time
38 time zones (38 cities + Coordinated Universal Time), city code display, city name display, daylight saving time on/off, automatic daylight saving time (DST) switching, home city switching time zone/world time
Stopwatch
Hundredths of a second stopwatch
Measuring Capability:
00’00”00~59’59”99 (for the first 60 minutes)
1:00’00~23:59’59 (after 60 minutes)
Unit of measurement:
1 hundredth of a second (for the first 60 minutes)
1 second (after 60 minutes)
Measurement mode: elapsed time, split/lap time
Timer
Countdown timer
Unit of measurement: 1 second
Countdown interval: 60 minutes
Countdown start time setting range: 1 second to 60 minutes (1 second increments and 1 minute increments)
Sound Reminder / Time Signal
5 reminders daily sounds
Hourly signal
Light
Double LED light
LED light for the dial (Super Illuminator, selectable illumination duration (1.5 seconds or 3 seconds), luminescence)
LED backlight for the digital display (Super Illuminator, selectable illumination duration (1.5 seconds or 3 seconds), luminescence)
Light color
LED: white
< h2>Calendar
Full automatic calendar (up to the year 2099)
Mute the volume
Turn the pressure tone on/off buttons
Energy saving function
Energy saving (display turns off to save energy when the watch is left in the dark)
Status display/alert battery life
Battery level indicator
Ride timing
Approximate battery run time:
7 months with rechargeable battery (operation period for normal use without exposure to light after charging)
18 months with rechargeable battery (operating period when stored in total darkness with the energy saving function activated after a full charge)
Accuracy
Accuracy: ±15 seconds per month (without Mobile Link function)
Other features
12/24 hour format
Display switching date/month
Day display (days of the week selectable in six languages)
Hand movement function (the hands move so as not to block the display of the contents of the digital display).
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
GST-B400-1A
