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 all-silver color GST-B400D.
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.
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 GST-B100 model.

• Case / bezel material: Resin / Stainless steel
• One-touch 3-fold Clasp
• Solid Band
• Water Resistant 200- meters
• Shock Resistant
• 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)
• 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)
• 5 daily alarms
• 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
• Full auto-calendar (to year 2099)
• 12/24-hour format
• Accuracy: ±15 seconds per month
• 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
• Size of case / Total weight

• • Size of case: 46.6×49.6×12.9mm
  • Total weight: 160 g
  • Free delivery
  • Money-back guarantee
  • Non-contact shipping
  • Secure payments