Casio G-Shock Men’s 54mm Gravitymaster GRB100GB-1A Resin Watch – Black/Gold $299

Constantly setting new standards for timekeeping, G-Shock is synonymous for providing the best of both analog and digital formats in a lightweight, styling package suited for the outdoor explorer or weekday warrior. The GRB100GB-1A is no exception. Featuring a double LED light, solar powered operation, world time across 39 cities, 5 multi-function daily alarms, 1/1000-second stopwatch, countdown timer, and a full-auto calendar ensuring you never miss an appointment. And as always the classic G-Shock protection, a combined resin and stainless steel case, a huge 200 metre water resistance and mobile link technology for even more control from your phone.


  • Casio G-Shock watches
  • Model: Gravitymaster
  • Model no.: GRB100GB-1A
  • For men
  • Movement: Quartz
  • Dial colour: Black
  • Band colour: Black
  • Case colour: Black/Gold
  • Case material: Resin/stainless steel backing
  • Band material: Resin
  • Band measurement (approx. mm):
    • Width: 20
    • Length including the face: 250
  • Case diameter (approx. mm, includes casing): 54
  • Case thickness (approx. mm): 17
  • Clasp type: Buckle
  • Water resistance: 200m (20ATM)
  • Shock and magnetic resistant
  • Mineral glass
  • Mobile link (Wireless linking using Bluetooth)
  • 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)
  • World time:
    • 39 time zones (39 cities + coordinated universal time)
    • One-touch UTC time zone
    • Daylight saving on/off
    • Auto summer time (DST) switching
    • Home city/World time city swapping
  • 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 and 1-hour increments)
  • 5 multi-function alarms (with countdown, 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), 1 dial (countdown indicator)
    • Digital: Hour, minute, second, pm, month, date, day
  • Accuracy: ±15 seconds per month
  • Battery: Solar
  • Battery life: 6 months (without exposure to light); 19 months (in total darkness w/ power save function on)
  • Original box: Yes – ready for gift giving!
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