The Casio G-SHOCK G-Steel Bluetooth Solar GST-B400-1AER will appeal to men who appreciate high durability and practical use of accessories. It features the high shock resistance for which the brand is known. The silver plastic envelope is fixed on a black elastic rubber strap. Protection of the dial is provided by mineral glass. The device is equipped with numerous functions: Bluetooth® connectivity, stopwatch - 1/100th of a second, timer, 5 daily alarms, Smartphone Link options, world time: more than 300 cities, automatic time adjustment, watch setting, "find my phone", day of the week and month display, full automatic calendar, 12/24-hour format, on/off button action sound, battery level indicator, dual LED light (Super Illuminator and glow: 1,5 or 3 seconds). The model is powered for operation by a state-of-the-art solar mechanism, which is resistant to swimming and diving without an aqualung thanks to its water resistance of 200 meters. The warranty covering the product is 3 years, and can be extended for a second one via the manufacturer's website.
Functions
5 daily alarms
The daily alarm reminds you about recurring events with an acoustic signal at the time you have set. This model has 5 independent alarms for flexible reminders of important appointments.
Battery level indicator
An indicator shows the current battery level.
Resin band
Synthetic resin is the ideal material for wrist straps thanks to its extremely durable and flexible properties.
Super-Illuminator
At the touch of a button, the display can be brightly illuminated in a fashionable color
Neo-display
A luminous coating provides long-term illumination in the dark after only a short exposure to light.
Mineral glass
The tough mineral glass resists damages.
Automatic calendar with Date, Day and Month
Once set, the automatic calendar always displays the correct date.
12/24-hour timekeeping
Times can be displayed in either a 12-hour or 24-hour format.
Multi-language
The name of the day can be displayed in different languages.
Button tones on/off
The button tones for using the mode button can be turned off. This means that the watch no longer beeps when switching from one function to another. Preset alarm or countdown timers remain active when the button tones are deactivated.
Hand Moving Function
With a push of a button, hands are moving and permit a free visibility of functions like stopwatch or date.
Phone Finder
Misplaced your smartphone? All it takes is the push of a button on your watch and the smartphone sounds an alarm.
Shock-resistant
Shock-resistant construction protects against impact and vibration.
Bluetooth® Smart
The watch is equipped with energy-saving Bluetooth® technology, which offers power-saving data transfer at the push of a button. The watch can connect to a smartphone wirelessly via Bluetooth®, enabling access to a wide range of useful functions.
Solar Power
A solar cell provides power for operation.
Stopwatch function - 1/100 sec. - 24 hours
Accuracy of measurement up to 1/100 of a second, measuring range up to 24 hours.
Timer - 1/1 sec. - 1 hour
For fans of precision: the countdown timers help you to remember specific or recurring events by giving off an audible signal at a preset time. They The time can be set to the nearest second and up to 24 hours in advance.
Folding clasp
The watch has a folding clasp.
Water resistance classification (20 bar)
Perfect for free diving without scuba gear: the watch is water resistant up to 20 bar according to ISO 22810.
World time function
Displays the current time in major cities and specific areas around the world.
What’s in the box?
3-year warranty
User manual
Warranty card
Casio box
Reviews about G-SHOCK G-Steel Bluetooth Solar GST-B400-1AER (7)
The G-SHOCK from the G-Steel series is a true beast with an elegant twist. The GST-B400-1AER model combines the legendary durability of G-SHOCK with a modern design that doesn’t clash even with more formal attire. What I love about it is the Tough Solar technology—you can forget about changing the battery because the watch charges from any light source. Thanks to Bluetooth, you can connect it to your smartphone, which makes life a breeze—the time sets itself, and the "find my phone" feature has saved me more than once. Despite its sturdy case, which is nearly 50 mm wide, it’s surprisingly slim for this series, so it sits comfortably on the wrist and doesn’t catch on sleeves. Water resistance to 200 meters means you can dive with it without worry, and the Super Illuminator backlight ensures the dial is legible in all conditions. As usual, Zegarownia offers excellent terms—a 3-year warranty with an extension option is standard, giving you peace of mind for years to come.
Hájek
1/22/26
100%
Very fast shipping
Eliška
12/20/25
100%
I bought a G-SHOCK watch as a holiday gift. It’s sturdy and stylish. The recipient was very happy with it. I recommend shopping at this store.
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The administrator of your personal data is the owner of the Watchard store, i.e. 57 Concepts Sp. z o.o. Sp. k. with the registered office at al. Witosa 31, lok. 115, 00-710 Warsaw, Poland. Providing personal data by the Customer is voluntary but necessary to complete the purchase. You have the right to view your personal data we have processed, as well as the right to request changes or removal of your personal data. Personal data will be processed for a period of 10 years.
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