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About the watch

Building on a classic, the GD-400MB has been tailored for the Military as part of the the Matte Black Collection. Stealthful and understated, the matte black finish is broken only by an inverted green and black LCD while additional protector bars guard the face for maximum durability. The perfect G Shock for discreet operations.

12/24 Hour Format

Times can be displayed in either a 12-Hour or 24 Hour Format.

Alarm Function

Snooze function: Each time you stop the alarm, it sounds again after a few minutes, Flash alert - the watch flashes with a buzzer at the time set, Hourly Time Signal: Causes the watch to beep every hour on the hour

Auto Calendar

Fully automatic calendar, with allowances made for leap years, pre-programmed to 2099

Product spec

Product Specification

  • 12/24 Hour Format - Times can be displayed in either a 12-Hour or 24 Hour Format.
  • Alarm Function - Snooze function: Each time you stop the alarm, it sounds again after a few minutes, Flash alert - the watch flashes with a buzzer at the time set, Hourly Time Signal: Causes the watch to beep every hour on the hour
  • Auto Calendar - Fully automatic calendar, with allowances made for leap years, pre-programmed to 2099
  • Countdown Timer - Measuring unit: 1/10 second, Countdown range: 24 hours
  • Display Illumination - Auto light switch, selectable illumination duration, afterglow
  • Stopwatch - 1/100th Sec Stopwatch
  • Water Resistant - 200 Metre/20 Bar
  • World Time - 31 time zones (48 cities + coordinated universal time)
  • Shock Resistant - Shock Resistant construction protects againt impact and vibration
  • Accuracy - +/- 15 seconds per month
  • Size of case - 55.0 x 49.7 x 16.6 mm
  • Total weight - 72 g
  • Button Tones On/Off - The button tones on the mode button can be switched off for discreet operation. Preset alarm or timer functions remain active.

Product Features

  • 12/24 Hour Format - Times can be displayed in either a 12-Hour or 24 Hour Format.
  • Alarm Function - Snooze function: Each time you stop the alarm, it sounds again after a few minutes, Flash alert - the watch flashes with a buzzer at the time set, Hourly Time Signal: Causes the watch to beep every hour on the hour
  • Auto Calendar - Fully automatic calendar, with allowances made for leap years, pre-programmed to 2099
  • Countdown Timer - Measuring unit: 1/10 second, Countdown range: 24 hours
  • Stopwatch - 1/100th Sec Stopwatch
  • Water Resistant - 200 Metre/20 Bar
  • World Time - 31 time zones (48 cities + coordinated universal time)
  • Shock Resistant - Shock Resistant construction protects againt impact and vibration
  • Accuracy - +/- 15 seconds per month
  • Size of case - 55.0 x 49.7 x 16.6 mm
  • Total weight - 72 g
Download PDF Manual

Collection tech

Shock Resistance

Your G-SHOCK will keep ticking after a kicking. Tested against drops of up to 10 metres in height, and able to sustain hammer blows with significant force, these are seriously tough timepieces.

Water Resistance

All G-SHOCK models are resistant to water up to 20 bar/ 200 metres in depth, making them perfect for outdoor and even underwater wear.