CASIO G SHOCK G-STEEL GST-B400D-1AJF GST-B400D-1A solar drive 20 bar watch

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G-Shock is a line of watches manufactured by Japanese electronics company Casio, designed to resist mechanical shock and vibration. G-Shock is an abbreviation for Gravitational Shock. The watches in the G-Shock line are designed primarily for sports, military and outdoors-oriented activities; nearly all G-shocks are digital or a combination of analog and digital and have a stopwatch feature, countdown timer, electroluminescent backlight and 200-metres of water resistance.

Product Description

 From the toughness watch G-SHOCK, it is G-STEEL's GST-B400 that is slim and has improved design. By reducing the size of parts and thinning the module, the functionality of Bluetooth® and solar is maintained while the thickness is reduced, and power consumption is also significantly reduced. In addition, the carbon core guard structure makes it the thinnest in the G-STEEL series (as of December 2020). The distance from the back to the bezel top is 12.9 mm, which is more than 1 mm thinner than the GST-B100. In terms of design, a large stainless steel button that is easy to press is used. It is a standard model with a silver case, and you can enjoy the difference in texture by giving different finishes to the TOP bezel and the middle bezel. The G-STEEL series combines different materials, metal and resin, to achieve both toughness and design.

Product specification

  • Case size (length x width x thickness)
  • 46.6 x 49.6 x 12.9 mm
  • mass
  • 160 g
  • Case / bezel material
  • Resin / stainless steel
  • band
  • Metal band (stainless steel)
  • Solid band
  • One-push three-fold type Nakadome
  • Construction
  • Impact resistant structure (shock resist)
  • Carbon core guard structure
  • Waterproof
  • Water resistant to 20 bar
  • Power supply / battery life
  • Tough solar (solar charging system)
  • Mobile link function
  • Mobile link function (function interlocking by Bluetooth communication with compatible mobile phones)
  • App
  • Compatible with "G-SHOCK Connected"
  • Glass
  • Inorganic glass
  • Band wearable size
  • 150-205mm
  • Other
  • Neobrite

    How Do I Return An Item?

    If you are not happy with your purchase and wish to return an item, please contact us within 7 days from receiving your order.
    Please provide your order number as well as the reason for your return. Our customer service team will review the return request and will send further instructions if the return is approved.

    Only items purchased directly from will be accepted. For products purchased from authorized retailers, please get in touch with them directly for returns.

    Returned items must be in original packaging, including any accessories, manuals, and documentation.

    Returned items must be unused, in the same condition that we sent it to you, and in their original packaging. Stains, folded cards, broken seals/ plastic foiling broken will not be accepted. If the condition of the product shipped back to us is not in acceptable condition we reserve the right to not refund or exchange. Products that have been personalized cannot be refunded or exchanged.

    Non-returnable items include items purchased through retailers, incorrect products purchased, and damaged products through customer mishandling.

    Returns made without receipt may be refused. Ippojapanwatch reserves the right to deny any return.

    CASIO G SHOCK G-STEEL GST-B400D-1AJF GST-B400D-1A solar drive 20 bar watch
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