Casio G-Shock GMA-B800 Series

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About GMA-B800 in Short. The watch connects to a smartphone four times a day and corrects the time automatically. The watch connects to a smartphone four times a day and corrects the time automatically. The watch connects to a smartphone four times a day and corrects the time automatically.


General Information

Price$120  *average Amazon Price, we may earn commission from purchases
Year of First Release2019
Battery Type CR2016 (Casio Batteries)
Manual5555 (official)

GMA-B800 Model Range *may be updated

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Official GMA-B800 Specs / Features *for base version GMA-B800-1A

  • Case / bezel material: Resin
  • Resin Band
  • Neobrite
  • Shock Resistant
  • Mineral Glass
  • 200-meter water resistance
  • Double LED light
    LED light for the face (Auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
    LED backlight for the digital display (Auto LED light, Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
  • Mobile link (Wireless linking using Bluetooth®)
  • Step count using a 3-axis acceleration sensor: 0 to 999,999 step count display range
    Step Goal Progress Display (step count goal setting range: 1,000 to 50,000, 1,000-step increments)
    Step Count Graph: Hourly step count for the past 11 hours on a 6-level graph
    Step indicator
    Power Saving: Auto sensor sleep state entry after fixed period of non-activity
  • Dual time (Home time swapping)
  • 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)
    Recorded data: Up to 200 records (measurement start month, date, lap/split times)
    Target Time alarm up to 10 Target Time settings
  • Countdown timer
    Timer for interval measurement (up to five time settings)
    Measuring unit: 1 second
    Input range: 00’00” to 60’00” (1-second increments)
    Others: Auto-repeat (number of repeats settable from 1 to 20), auto-start
  • Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents.)
  • 5 daily alarms
  • Hourly time signal
  • Full auto-calendar (to year 2099)
  • 12/24-hour format
  • Button operation tone on/off
  • Regular timekeeping
    Analog: 2 hands (hour, minute (hand moves every 20 seconds))
    Digital: Hour, minute, second, pm, month, date, day
  • Accuracy: ±15 seconds per month (with no mobile link function)
  • Approx. battery life: 2 years on CR2016
  • Size of case : 50.7×45.2×15.5mm
  • Total weight : 52g

You ask, we answer…

What does 200-meter water resistance in GMA-B800 mean?

The watch is good for swimming but not for deep diving.

What type of battery does GMA-B800 have?

2 years CR2016.

Does GMA-B800 have alarm?

Yes, it has 5 daily Alarms.