Revel in eclectic sophistication with the G-STEEL fusion of metal and resin components in a popular all-black G-SHOCK.

Tough construction meets stylish design in a black ion-plated metal bezel set against a base of jet black. With its slim combination module and Carbon Core Guard structure, the black-on-black take of the GST-B400 is a cool fashion statement ready for whatever you are.

• Case size (L× W× H)

  46.6 × 49.6 × 12.9 mm

• Weight: 80 g

• Case and bezel material

  Case/bezel material: Resin / Stainless steel

• Band

  Resin Band

• Construction

  Shock Resistant

  Carbon Core Guard structure

• Water resistance

  200-meter water resistance

• Power supply and battery life

  Tough Solar (Solar powered)

• Smartphone Link feature

  Mobile link (Wireless linking using Bluetooth®)

• Apps

  CASIO WATCHES

• Glass

  Mineral Glass

• Surface treatment

  Black ion plated case

• Compatible band size

  145 to 215 mm

• Other: Neobrite

• 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

• 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)

• Alarm/hourly time signal

  5 daily alarms

 Hourly time signal

• 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)

• Light color

  LED:White

• Calendar

  Full auto-calendar (to year 2099)

• Mute feature

  Button operation tone on/off

• Energy saving feature

  Power Saving (display goes blank to save power when the watch is left in the dark)

• Battery display/alert

  Battery level indicator

• 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)

• Accuracy

  Accuracy: ±15 seconds per month (with no mobile link function)

• 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

• Case / bezel material: Resin / Stainless steel
• Resin Band
• Mineral Glass
• Neobrite
• Shock Resistant
• Carbon Core Guard structure
• 200-meter water resistance
• Shock resistant (G-SHOCK)
• Tough Solar (Solar powered)
• 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)
• Mobile link (Wireless linking using Bluetooth®）
• Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents)
• 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
• 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
• 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)
• 5 daily alarms
• Hourly time signal
• Battery level indicator
• Power Saving (display goes blank to save power when the watch is left in the dark)
• Full auto-calendar (to year 2099)
• 12/24-hour format
• Button operation tone on/off
• Date/month display swapping
• Day display (days of the week selectable in six languages)
• 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
• Accuracy: ±15 seconds per month (with no mobile link function)
• 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)

• Case / bezel material: Resin / Stainless steel
• One-touch 3-fold Clasp
• Solid Band
• Stainless Steel Band
• Shock Resistant
• Mineral Glass
• Carbon Core Guard structure
• Black ion plated bezel
• 200-meter water resistance
• Shock resistant (G-SHOCK)
• Tough Solar (Solar powered)
• 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)
• Mobile link (Wireless linking using Bluetooth®）
• Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents)
• 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
• 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
• 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)
• 5 daily alarms
• Hourly time signal
• Battery level indicator
• Power Saving (display goes blank to save power when the watch is left in the dark)
• Full auto-calendar (to year 2099)
• 12/24-hour format
• Button operation tone on/off
• Date/month display swapping
• Day display (days of the week selectable in six languages)
• 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
• Accuracy: ±15 seconds per month (with no mobile link function)
• 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)

• Case / bezel material: Resin / Stainless steel
• One-touch 3-fold Clasp
• Stainless Steel Band
• Solid Band
• Mineral Glass
• Neobrite
• Shock Resistant
• Carbon Core Guard structure
• Black ion plated case
• Black ion plated band
• 200-meter water resistance
• Shock resistant (G-SHOCK)
• Tough Solar (Solar powered)
• 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)
• Mobile link (Wireless linking using Bluetooth®）
• Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents)
• 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
• 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
• 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)
• 5 daily alarms
• Hourly time signal
• Battery level indicator
• Power Saving (display goes blank to save power when the watch is left in the dark)
• Full auto-calendar (to year 2099)
• 12/24-hour format
• Button operation tone on/off
• Date/month display swapping
• Day display (days of the week selectable in six languages)
• 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
• Accuracy: ±15 seconds per month (with no mobile link function)
• 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)

• Case / bezel material: Resin / Stainless steel
• One-touch 3-fold Clasp
• Solid Band
• Stainless Steel Band
• Shock Resistant
• Neobrite
• Mineral Glass
• Carbon Core Guard structure
• 200-meter water resistance
• Shock resistant (G-SHOCK)
• Tough Solar (Solar powered)
• 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)
• Mobile link (Wireless linking using Bluetooth®）
• Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents)
• 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
• 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
• 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)
• 5 daily alarms
• Hourly time signal
• Battery level indicator
• Power Saving (display goes blank to save power when the watch is left in the dark)
• Full auto-calendar (to year 2099)
• 12/24-hour format
• Button operation tone on/off
• Date/month display swapping
• Day display (days of the week selectable in six languages)
• 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
• Accuracy: ±15 seconds per month (with no mobile link function)
• 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)