G-Shock G-STEEL Slim Analog-Digital Metal-Black Men's Watch GSTB400-1A

$320.00
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Brand-New, 100% Authentic. We are an Authorized G-Shock Retailer. Includes G-Shock Backed Warranty at no extra charge.

Introducing a new lineup of slim G-STEEL GSTB400 models with new, improved designs made possible by a thin module and carbon core guard structure. The standard model in this lineup, the GSTB400-1A sports a silver color face and resin band.

The GSTB400 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.

In addition, the carbon core guard structure of this model helps to make it the thinnest of the G-STEEL Series (as of Apr 2021) while maintaining a high level of impact resistance. The thickness from the back cover to the bezel top is only 12.9 mm, which is more than one millimeter less than the GSTB100 model.

In terms of design, the number of button guards has been reduced as much as possible, enabling the use of large stainless steel buttons that are slim yet easy to operate. The top bezel has been given five different finishes, while the middle bezel has been given four different finishes, which creates an elegant effect and changes the appearance of the texture of the metal depending on the viewing angle.

Item G-Shock Men's Watch
Model # GSTB400-1A
Series G-STEEL
Case Shock Resistant - Carbon Core Guard Structure
Case Back Stainless Steel
Case Width 49 mm (Case Thickness - 12.9 mm)
Dial Color Black
Dial Features Bluetooth Connectivity / Double LED Light / Mobile Link with Bluetooth / World Time / Stopwatch / Alarms / Battery Level Indicator / Calendar
Watch Lens Mineral Glass
Strap Color Black
Strap Material Resin Band (Strap Width 27 mm / Strap Length 8 inches)
Clasp Pin Buckle
Movement Tough Solar Power
Water Resistant 200 Meters

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FREE SHIPPING for all US Orders.

  • Fast and quick shipping. Most orders arrive in 3-5 business days!
  • Expedited Shipping available for $39.99
  • Hand inspection before shipping to check for scratches, dents and ensure you have an operational battery.
  • Packages do not ship on the weekends. All orders placed on Friday after 10:00 AM (CST), will be shipped on Monday, including expedited orders.

Lighting fast international shipping available. We pay for insurance too!

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Easy 30-Day Money-Back FREE Return Policy. 

Free Returns only eligible for orders under $500. For orders over $500, returns are accepted within the 30-day time period, but customers must pay for shipping and insurance fees. Please be sure to require a signature confirmation for all orders over $500 and include insurance to cover any lost or damages to the package.

All merchandise (except those indicated as no returns or any merchandise in our Vintage Watches Corner) purchased on TimeMachinePlus.com may be returned in their original, unused condition for a full refund of the purchase price within 30 days from original shipment dispatch date. All returned watches must be not sized and unworn in the condition you received them and in the original box. Conditions apply.


Find more information here.

  • Shock Resistant
  • Carbon Core Guard structure
  • Mineral Glass
  • Neobrite
  • 200-meter water resistance
  • Case / bezel material: Carbon / Stainless steel
  • Resin Band
  • Double LED light
  • LED light for the face (Full auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
  • LED backlight for the digital display (Full auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
  • Tough Solar (Solar powered)
  • Mobile link (Wireless linking using Bluetooth®)
  • World time
  • 39 time zones* (39 cities + coordinated universal time), daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping
  • *May be updated when connected to a smartphone.
  • 1/1000-second stopwatch
  • Measuring capacity:
  • 00'00''000~59'59''999 (for the first 60 minutes)
  • 1:00'00''0~23:59'59''9 (after 60 minutes)
  • Measuring unit:
  • 1/1000 second (for the first 60 minutes)
  • 1/10 second (after 60 minutes)
  • Measuring modes: Elapsed time, split time
  • Countdown timer
  • Measuring unit: 1/10 second
  • Countdown range: 24 hours
  • Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments)
  • 5 multi-function alarms (with daily, 1 time, schedule)
  • Hourly time signal
  • Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents.)
  • Battery level indicator
  • Full auto-calendar (to year 2099)
  • 12/24-hour format
  • Button operation tone on/off
  • Power Saving (display goes blank and hands stop to save power when the watch is left in the dark)
  • Regular timekeeping
  • Analog: 3 hands (hour, minute (hand moves every 10 seconds), second),
  • Digital: Hour, minute, second, pm, month, date, day
  • Accuracy: ±15 seconds per month (with no mobile link function)
  • Approx. battery operating time:
  • 6 months on rechargeable battery (operation period with normal use without exposure to light after charge)
  • 20 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
  • LED:White
  • Module: 5631
  • Size of case: 51×50×14.5mm
  • Total weight: 91g
Warranty periods range from 12 months to 10 Years, depending on the brand. All of the brands we carry come with their international manufacturer warranty. All warranty issues are to be handled directly with the watch manufacturer, so be sure to keep your electronic invoice for proof of purchase from TimeMachinePlus.com as we're an authorized retailer. Contact the brand directly using the information in your warranty booklet or the manufacturer's website for complete warranty terms and repair instructions. Typically the manufacturer's warranty does not cover: battery, crystal, strap or bracelet; damage resulting from improper handling, lack of care, accidents or normal wear and tear; damage from contact with objects; water damage.
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G-Shock G-STEEL Slim Analog-Digital Metal-Black Men's Watch GSTB400-1A
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