| Size | ★★★★★ |
| Weight | ★★★★★ |
| Functions | ★★★★★ |
| Materials | ★★★★★ |
| Battery Years | ★★★★★ |
| Price | ★★ |
GST-B400 Model Range *may be updated
Quick Content Guide
- GST-B400 Model Range *in different colors and bands
- Japanese Unique Features in GST-B400! *the most distinctive features in details
- General information about the watch *year of first release, model range etc.
- Official GST-B400 Video *only from Casio Company
- G-Shock GST-B400 Display Guide *for key functions only
- G-Shock GST-B400 on the wrist *only images and only on the wrist
- GST-B400 Usage Patterns *what the watch is usually meant for
- GST-B400 Limited Editions *unique style, materials, and price
- The most distinctive specs *from our Editorial point of view
- Other G-Shock GST Watches *similar by price and functions but different by cases
- Official GST-B400 Specs *all details and for base version GST-B400-1A
- G-Shock GST-B400 PROs & CONs *by experts with 10 years experience
- GST-B400 Comparison Table *with similar G-Shock Watches
- Recent News about GST-B400 *the latest breaking news and videos
Enjoy Japanese Unique Features in GST-B400!
Tough Solar & Improved Readability. The GST-B400 is powered by G-SHOCK Tough Solar power system, charged by both real and artificial light sources. To ensure great readability, as well, a dial indicator at the 9 o’clock position display the mode, battery level and more.
Stylish & Sophisticated looks. The watch features a stainless-steel bezel in a sophisticated new shape. Attention to detail and material quality are paramount for the G-STEEL, featuring unique finishing techniques like hairline, mirror and polishing, highlighting an impressive array of surface textures that captivate the eye from every angle.
Metal Band with Double Slide Lever. This allows quick and easy change of the bands.
Slimness & Energy-Saving Module. Optimised, high-density mounting of the circuit board structure has made it possible to slim the module of the new GST-B400. A substantial reduction in power consumption was also achieved by reducing the number of watch hands to two and adopting a low-power Bluetooth® system.
Shock Resistant. Shock-resistant construction protects against impact and vibration.
G-SHOCK CONNECTED App. Connection with a phone requires installation of the G-SHOCK CONNECTED App on the phone.
General Information
| Price | $320 *average Amazon Price, we may earn commission from purchases |
| Year of first Release | 2021 |
| Suitable for Wrist Size | 160 – 230 mm |
| Module Number | 5657 / Manual |
| Model Range | G-STEEL (G-Steel are refined watches and combine high-quality materials with G-Shock’s standard of toughness. Its layered guard structure boasts a double-layer bezel construction of stainless steel and resin or resin and fine resin which delivers the hard, sleek beauty of metal while retaining the impact absorption of resin.) |
| Battery Type | Solar (G-Shock Batteries) |
| Other Divisions the GST-B400 belongs to: *you may find all watches of the division by clicking on the link | G-Shock Ana-Digi G-Shock Bluetooth G-Shock Solar G-Shock 2021 |
G-SHOCK G-STEEL Evolution Timeline
April, 2022
GST-B500
370$ on Amazon →
★★★★
The GST-B500 line brings together smaller components and high-density mounting, continuing to deliver Bluetooth connectivity and solar power charging.
More →
May, 2021
GST-B400
350$ on Amazon →
★★★★
An ultra-thin module encased in carbon fiber makes for a stylish G-STEEL timepiece with the slimmest profile yet.
More →
August, 2020
GST-B300
300$ on Amazon →
★★★★
A model that adds a rugged design to a G-STEEL model that uses the carbon core guard structure from G-SHOCK, which continues to evolve in the pursuit of toughness.
More →
March, 2019
GST-B200
250$ on Amazon →
★★★★
A G-STEEL model that uses the carbon core guard structure.
More →
Official GST-B400 Video
G-Shock GST-B400 Display Guide *for key functions only. For you to know how it works))
General Display
- Hour hand
- Minute hand
- LCD
- Mode hand
Indicates the current mode. In the Timekeeping Mode, this hand shows the current charge level.
Shifting Hands to Read the Digital Display
Hand shift moves the hands out of the way for easy viewing of display information
Phone Finder
You can use phone finder to trigger a tone on the phone to make it easy to find. The tone is forced to sound even if the phone is in vibrate mode.
Checking World Time
Enter the World Time.
After the currently selected World Time City name appears, the watch will display the current time in that city.
G-Shock GST-B400 on the wrist!
GST-B400 Usage Patterns *what the watch is usually meant for
Feedback from Users *accumulated information from our own comments and emails, forum threads, socials, reviews, etc.
PROs
+ looks a lot more expensive than it is
+ the strap looks very comfortable
+ fits just fine and the lightweight is a plus
+ they fixed the battery indicator from the gst-b100 so it’s easier to check the battery level
+ they slimmed down the watch
CONs
– too few color/ stainless steel variants with straps without negative displays
– no backlight movement detector and timer
– no lume
– at that price it should DEFINITELY have a sapphire glass
– they removed a very useful second hand
GST-B400 Limited Editions *unique style, materials, and price
The Listing of All G-Shock GST-B400 Limited Watches → *with detailed description about the style
What we like in GST-B400 *comments by experts with 10 years experience in writing about Casio watches
— The Slimmest-Ever G-STEEL as for 2021 (it features a new, improved module built to deliver slimness)
— Beautiful battery level indicator at 9 o’clock (displays the mode, battery level and more)
— Vapor deposition-treated dials (for highly chromogenic and distinctive coloration)
— Tough Solar (CASIO’s original solar-charging system converts not only sunlight but also light from fluorescent lamps and other sources into power)
— G-SHOCK Connected App (you may manage all watch settings through your phone)
Other G-Shock GST Watches *similar by price and functions but different by cases
These are not all G-Shock GST Series. Here is a list of All G-Shock GST Watches →
Official Casio Description. Introducing new color variations to the lineup of slim G-STEEL GST-B400 models with new, improved designs made possible by a thin module and carbon core guard structure. There is a standard model in this lineup, the GST-B400 with silver color face and resin band.
The GST-B400 is made possible by even further miniaturization of its parts and thinning of its modules without sacrificing any Bluetooth or solar function. Power consumption has also been significantly reduced.
Official GST-B400 Specs / Features *for base version GST-B400-1A
- 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) - Size of case : 46.6×49.6×12.9mm
- Total weight : 80g
G-SHOCK GST-B400 PROs & CONs
*we composed all points based on our ten years experience in writing about CASIO watches. We know what matters when you are searching for your ideal G-SHOCK!
– Ultra-thin Module (46.6 × 49.6 × 12.9 mm)
– Carbon Core Guard (the watch is more lightweight but stronger in comparison with a traditional structure)
– Dedicated App for your Phone (easy to operate & other features)
– Bluetoot Accuracy Calibration (checks if the watch shows the ideal time), also called Mobile Link
– Stylish Steel Look (exceptional metal textures from every angle)
– Solar Powered (Tough Solar). No need to worry about the battery change
– No Second Hand
– Only Mineral Glass (could be Sapphire)
– Mostly traditional functions (World time, Stopwatch, Timer, Alarms etc.)
– No Radio Calibration (you have only Mobile Link accuracy)
– Poor digital display readability (if the model uses negative display type)
GST-B400 Comparison Table with similar G-Shock Watches
GST-B400 | |||
Price (Amazon) | |||
Year of first Release | 2021 | 2019 | |
Accuracy | Bluetooth (via phone app) | Bluetooth (via phone app) | Bluetooth (via phone app) |
SmartWatch Features | G-SHOCK Connected App | G-SHOCK Connected App | G-SHOCK Connected App |
Light | Neobrite and Double LED light | Neobrite and Double LED light (Full auto LED light, Super illuminator) | Neobrite and Double LED light (Full auto LED light, Super illuminator) |
Alarm | 5 daily alarms | 5 multi-function alarms (with daily, 1 time, schedule) | 5 multi-function alarms (with daily, 1 time, schedule) |
Timer | Measuring unit: 1 second | Measuring unit: 1/10 second | Measuring unit: 1/10 second |
Stopwatch | 1/100-second stopwatch | 1/1000-second stopwatch | 1/1000-second stopwatch |
Hourly Time Signal | Yes | Yes | Yes |
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 | 39 time zones* (39 cities + coordinated universal time), daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping | 39 time zones* (39 cities + coordinated universal time), daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping |
Multi Day Format | Yes | Yes | No |
Multi Language Day | Yes | Yes | No |
Second Hand | No | Yes | Yes |
Case / bezel material | Resin / Stainless steel | Resin / Stainless steel | Carbon / Stainless steel |
Glass | Mineral Glass | Mineral Glass | Mineral Glass |
Battery | Solar powered | Solar powered CTL1616 | Solar powered CTL1616 |
Size (mm) *we consider 48.9×42.8×13.4 to be a traditional watch size (as in DW-5600). So you are to compare how far or close the watch is to this size | 46.6×49.6×12.9 | 51×50×15.5 | 53.3×49.2×14.5 |
Recent News about GST-B400
- [G-SHOCK 2023] GST-B400BB-1A — Originating the Love for Music
- [G-SHOCK 2023] GST-B400BB-1A — Black Warrior and DDR Motorcycle Club
- [G-SHOCK 2023] GST-B400BB-1A — The Dark Steel Warrior
- [G-SHOCK 2023] GST-B400BB-1A — Black on Black G-Steel
- [G-SHOCK Comparison] GST-B500 VS GST-B400 VS GST-B100
You ask, we answer…
It’s CASIO’s original solar-charging system that converts not only sunlight but also light from fluorescent lamps and other sources into power.
They are used for highly chromogenic and distinctive coloration.
You may manage all watch settings through your phone.
Not sure about GST-B400? There are more G-Shocks!
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