GSTB400CX-1A - Year Of The Snake

From G-SHOCK’s G-STEEL series, which fuses metal and resin, comes a special model celebrating the Year of the Snake in 2025.

The base model is the slim-design GST-B400, featuring a motif inspired by the Ouroboros, an ancient symbol of a snake representing infinity and immortality, both considered to be auspicious symbols of good fortune.

The watch’s silver metal bezel, black face, and gold accents offer a versatile look that suits both formal and casual styles. To further celebrate the Year of the Snake, snake patterns are incorporated into the side buttons and components at the 3 and 9 o’clock positions on the face. The case back is engraved with a special illustration of the Ouroboros, which symbolises limitless potential.

The GST-B400 delivers high-level functionality with Bluetooth® and solar power technology while significantly reducing power consumption. Large stainless-steel buttons contribute to ease of use, while the model’s resin band and silver case create a standard yet refined look, while the distinct finishes of the top and middle bezels add a sophisticated texture contrast.

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)

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 colour
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

Smartphone Link feature
Mobile link (Wireless linking using Bluetooth®)

Apps
CASIO WATCHES 
Available App Store and Google Play 

Glass
Mineral Glass

Surface treatment
Black ion plated case

Compatible band size
145 to 215 mm

Other
Neobrite