Casio G-Shock GMD-B800 Watches

Introducing new compact G-SHOCK model that is great choice for women who prefer mannish G-SHOCK styling.
These models add a new selection of colors to the G-SQUAD lineup of sports watches that make daily training more fun and effective. The size of the GMD-B800 case is approximately 3 mm smaller than the case of the popular G-SHOCK GBA-800, which makes it the perfect choice for those with smaller wrists and those who prefer a more compact watch.
The two summer nuance colors of the GMD-B800 model go well with a wide range of fashion items. A back protector cusions impact, while block coloring and new materials create designs with plenty of visual impact.


Enjoy Japanese approaches to Tough and Functional Watches!

Band with superior wearability. The 15-hole band is designed to enable fine adjustments. The case is equipped with a special case back protector, to assure a comfortable fit.

STEP TRACKER. A built-in 3-axis acceleration sensor begins counting steps the moment you start to walk.
A step number level graph at 6 o’clock shows the current step number and the number 1 hour earlier,
and a status indicator window in the upper right area of the dial displays the target achievement rate.
This data can help motivate you to increase your step count.

[App] Step Count Measurement Data Transfer. Measurement data can be transferred for use to a dedicated app. In addition to manual transfers, the app conducts automatic transfers four times a day.
Besides recording daily step counts and calorie consumption, the app displays a step count graph showing step counts, calories and exercise intensity (5 levels) for each day, week and month.
When activated by the smartphone, the step count is displayed graphically on a map every 30 minutes.

TIMER. A multi-timer function useful for interval workouts can be set for up to five different times.
The time remaining on the timer (%) is indicated in the status indicator window to the upper right on the dial.
Auto Repeat (maximum 20 times) and Auto Start are available along with an announcement notice function.

[App] Create Timer Menu. Up to 20 sets of 5 timers can be set up on the dedicated app. This makes it easy to create a menu of workouts and intervals as sets of workouts and break times that repeat within a certain period. You can save the menus you create under individual titles. You can then call them up instantly according to the day of the workout and transmit the settings to the watch.

STOPWATCH. A 1/100-second stopwatch capable of storing up to 200 lap-time memories is installed. Its ability to set up to 10 target times is useful for confirming your pace.

[App] Stopwatch Measurement Data Transfer. A special app is available for setting target times. Stopwatch measurement data can be transferred, moreover, with measurement/target time differences and the best/worst/average times displayed together on the app. The results can be managed as log memory data and fed back into daily workouts.

Smartphone App. – Auto Time Adjustment (4 times a day)
– World Time city setting (over 300 cities)
– Home Time / World Time switching
– Time alarm setting
– Daylight Saving Time / Automatic time zone information update
– Mobile phone search
– Auto Hand Home / Position Correction
– Step count measurement data transfer
– Timer menu creation

Shock Resistant. Shock-resistant construction protects against impact and vibration.



Important Information

  • Price — 100$ *average Amazon Price, we may earn commission from purchases
  • Year of first Release —  2020
  • Module Number — 3486 / Manual
  • Model Range — G-SQUAD  (A new sports line that supports your active life by managing your daily exercise using your watch and smartphone. All watches are equipped with health and fitness support functions, include a 3-axis accelerometer that keeps track of step count, a Multi-Timer that lets you create up to 20 timer combinations of five timers each, memory for up to 200 lap records, and with the help of the phone app, a calorie-use counter. Ideal for interval training for running, gym activities and other sports.)
  • Other Divisions the GMD-B800 belongs to: *you may find all watches of the division by clicking on the link
  • Battery Type — CR2025 (G-Shock Batteries)

Feedback from Users *accumulated information from our own comments and emails, forum threads, socials, reviews, etc.

PROs
+ classy looking
+ perfect size
+ bluetooth

CONs
– small digits

Feedback from Experts *based on comparison info with similar watches by price, model range, etc.

PROs
+ hourly Time Signal
+ affordable price
+ very accurate. Bluetooth (via phone app)
+ smart feature via G-Shock Connected App

CONs
– 3 years battery
– no World Time
– no Altimeter and Barometer
– no Compass
– no Multi Timer
– no Thermometer
– no Vibration
– no Optical sensor (for Heart Rate)
– no GPS Functionality
– no USB Charging


GMD-B800 Model Range *may be updated

*You may find updated information about colors on our G-Shock 2021 New Releases page →


The most distinctive specs of GMD-B800 *Editorial
— 200-meter water resistance
(good for swimming but not for deep diving)
— G-SHOCK Connected App (you may manage all watch settings through your phone)
— Mobile link (Wireless linking using Bluetooth(R)) (for time sync with your phone data)
— Step count (A built-in 3-axis acceleration sensor begins counting steps the moment you start to walk.)
— Stopwatch with Target Time alarm (lap/split display switching, up to 10 Target Times, 200 lap time records)
— Interval timer with up to five time settings (Auto repeat up to 20 times, skip, auto start, alert sound)


Other G-Shock GMD Watches *similar by price and functions but different by cases


Official GMD-B800 Video

Official Marketing Focus from Casio

Function-wise, the watch can link with a smartphone using Bluetooth® communication, which makes sports activities even more fun than ever. The watch links with the G-SHOCK Connected phone app to provide access to a number of functions that support workouts. Daily health and fitness support functions include a 3-axis accelerometer that keeps track of step counts, a timer that lets you create up to 20 combinations of five timers each, memory for up to 200 lap records, and more. G-SHOCK Connected also makes it possible to maintain step count logs with five exercise intensity levels, calculate the calories you burn, specify a daily step target, create timer combinations and send them to the watch, store stopwatch measurement data, view data, and more. All of this combines to help you plan and record your workouts, making them more effective and enjoyable.

Official GMD-B800 Specs / Features *for base version GMD-B800-1

  • Case / bezel material: Resin
  • Resin Band
  • Shock Resistant
  • Mineral Glass
  • 200-meter water resistance
  • LED backlight (Super Illuminator)
    Auto light switch, 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 7 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, hour, minute, 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
  • 5 daily alarms
  • Hourly time signal
  • Full auto-calendar (to year 2099)
  • 12/24-hour format
  • Button operation tone on/off
  • Regular timekeeping: Hour, minute, second, pm, year, month, date, day
  • Accuracy: ±15 seconds per month (with no mobile link function)
  • Approx. battery life: 3 years on CR2025

GMD-B800 Comparison Table with similar G-Shock Watches


GMD-B800

Price (Amazon)

Year of first Release

2020

Accuracy

Bluetooth (via phone app)

Bluetooth (via phone app), GPS Signal Reception

Bluetooth (via phone app)

SmartWatch Features

G-SHOCK MOVE App

G-SHOCK MOVE App

G-Shock Connected App (simplifies certain watch operations by letting you perform them on your phone screen)

Optical sensor (for Heart Rate)

No

Wrist heart rate measurement (maximum measurement value: 220 bpm)

No

Step Count

Yes

Yes

Yes

GPS (for distance and speed monitor)

No

GPS Functionality (Acquires data of current location from GPS satellite, measures distance travelled, speed, pace, and other data. In addition to GPS, the watch acquires data from GLONASS and Michibiki (QZSS) satellite systems)

No

USB Charging

No

Yes (After about 2.5 hours of charging, training features can be used continuously for up to 14 hours)

No

Light

LED backlight (Super illuminator)

LED backlight (Super illuminator)

LED backlight (Super illuminator)

Alarm

4 daily alarms with snooze

4 daily alarms with snooze

5 daily alarms

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)

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)

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

Stopwatch

1-second stopwatch
Measuring capacity: 99:59'59''
Measuring modes: Elapsed time, split time

1-second stopwatch
Measuring capacity: 99:59'59''
Measuring modes: Elapsed time, split time

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, hour, minute, lap/split times)
Target Time alarm up to 10 Target Time settings

Hourly Time Signal

No

No

Yes

World Time

38 time zones* (38 cities + coordinated universal time), daylight saving on/off, auto summer time (DST) switching
* May be updated when connected to a smartphone.

38 time zones* (38 cities + coordinated universal time), daylight saving on/off, auto summer time (DST) switching
*May be updated when connected to a smartphone

for approximately 300 cities

Altimeter

No

Yes

No

Barometer

No

Yes

No

Compass

No

Yes

No

Multi Timer

No

Yes

No

Thermometer

No

Yes

No

Vibration

Yes

Yes

No

World Time

Yes

Yes

No

Case / bezel material

Resin / Aluminum

Resin / Stainless steel

Resin

Glass

Mineral Glass

Mineral glass

Mineral glass

Battery

2 years on CR2032

Solar powered

3 years on CR2025

Size (mm) *we consider 48.9×42.8×13.4 to be a traditional watch size (as in DW-5600). So you are to compare how far or close the watch is to this size

58.2×49.3×17

63×55×20.4

50.7×45.2×15.5


Full features (if you want to know more)



GMD-B800 Replacement Band (Strap) *availability
We think it is very important (before buying a new watch) to know if there will be some choice as for replacement bands for GMD-B800 (in future or even now). So we made a research and you shouldn’t worry about your future as the bands are available for buying.

starting from 64$ on PacParts →


Recent News about GMD-B800

All Casio GMD-B800 News →


You ask, we answer…

What does G-SHOCK Connected App in GMD-B800 do?

You may manage all watch settings through your phone.

What is Mobile link in GMD-B800?

Wireless linking using Bluetooth(R) (for time sync with your phone data).

What does Step count in GMD-B800 mean?

It is a built-in 3-axis acceleration sensor that begins counting steps the moment you start to walk.

What is Stopwatch with Target Time alarm in GMD-B800?

It’s a lap/split display switching, up to 10 Target Times, 200 lap time records.

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