Casio G-Shock GW-7900 — Large Bezel Screws & Protruding Surfaces

Battery Years★★★★★

GW-7900 Model Range *may be updated

*Want to be the first to know about new G-Shock Updates? Here we store all recent Monthly G-Shock Updates →

Quick Content Guide

  1. GW-7900 Model Range *in different colors and bands
  2. General information about the watch *year of first release, model range etc.
  3. Official GW-7900 Video *only from Casio Company
  4. G-Shock GW-7900 Display Guide *for key functions only
  5. G-Shock GW-7900 on the wrist! *only images and only on the wrist
  6. GW-7900 Usage Patterns *what the watch is usually meant for
  7. The most distinctive specs *from our Editorial point of view
  8. Other G-Shock GW Watches *similar by price and functions but different by cases
  9. Official GW-7900 Specs *all details and for base version GW-7900B-1
  10. G-Shock GW-7900 PROs & CONs *by experts with 10 years experience
  11. Famous people wearing G-Shock GW-7900! *updates
  12. Japanese Unique Features in GW-7900 *the most distinctive features in details
  13. GW-7900 Comparison Table *with similar G-Shock Watches
  14. Full Photo Gallery *various images
  15. Recent News about GW-7900 *the latest breaking news and videos

About the Watch in short. A popular digital series with advanced features. The large case and powerful bezel screws emphasize the visual power of the GW-7900 – the watch module is protected from any negative influences. The main advantage of the model is the availability of solar power [recharging the battery from daylight] and radio time synchronization. Surfers and people associated with the maritime business will find useful functions for themselves – the phase of the moon and the level of the ebb / flow in a particular place are displayed. Thanks to the electronic dial, the information is displayed in a detailed form. In addition to specific functions, the watch also has basic features – a 24-hour stopwatch, a timer, world clock, a calendar and backlight with automatic response when you turn your hand.

General Information

Price$90 *average Amazon Price, we may earn commission from purchases
Year of first Release2009
Suitable for Wrist Size150 – 230 mm
Module Number3200 / Manual
Model RangeSTANDART DIGITAL (This Line includes Digital G-Shocks that are the best in “price/quality” category. Usually have traditional digital functions.)
Battery TypeSolar (G-Shock Batteries)
Buy Battery on Amazon →
Other Divisions the GW-7900 belongs to: *you may find all watches of the division by clicking on the linkG-Shock Tide Graph
G-Shock Solar

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Official GW-7900 Video

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G-Shock GW-7900 Display Guide *for key functions only. For you to know how it works))

General Display

  • Press (C) to change from mode to mode.
  • In any mode (except when a setting screen is on the display), press (L) to illuminate the display.

World Time

World Time shows the current time in 48 cities (31 time zones) around the world.


The Alarm Mode gives you a choice of four one-time alarms and one snooze alarm.
Also use the Alarm Mode to turn the Hourly Time Signal (SIG) on and off.

Countdown Timer

You can set the countdown timer within a range of one minute to 24 hours. An alarm sounds when countdown reaches zero.
– All of the operations in this section are performed in the Countdown Timer Mode, which you enter by pressing (C).

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G-Shock GW-7900 on the wrist!

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GW-7900 Usage Patterns *what the watch is usually meant for

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

+ moon phase data
+ solar panel and rechargeable battery; no need to worry about battery dying
+ easy to read
+ easy setup
+ automatic atomic calibration
+ larger display
+ backlight
+ the watch is tough and can take a battering
+ accurate time keeping. Seeing as the phone sets itself via radio signal each night I know its accurate to the second. Not having to manually set the time is a boon!
+ watch is incredibly comfortable to wear: soft is a word that pops into the mind

– negative display
– small moongraph

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

+ very accurate. Radio-controlled (via atomic watch signals)
+ Full-Auto Illuminator
+ solar powered
+ Moon Graph
+ Tide Graph

– no Hourly Time Signal
– no Data Memory

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What we like in GW-7900 *comments by experts with 10 years experience in writing about Casio watches
— 200-meter water resistance
(good for swimming but not for deep diving)
— Tough Solar (CASIO’s original solar-charging system converts not only sunlight but also light from fluorescent lamps and other sources into power)
— Radio-controlled Watch; Multi band 6 (additional way for time sync. This watch receives time calibration radio signals that keep the displayed time accurate)
— Moon data (moon age of the specific date)
— Tide graph (tide level for specific date and time)

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

These are not all G-Shock GW Series. Here is a list of All G-Shock GW Watches →

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Official Casio Description. The G-SHOCK G-Rescue series combine tough, high-performance digital timekeeping with radio-controlled accuracy. Large buttons are designed to allow operation while wearing thick gloves, for even those with protective clothing. Tide Graph and Moon Phase features show tide and moon information for preset areas. Other advanced features include highly shock-resistant construction, a Tough Solar power system, MULTIBAND 6 reception of six time calibration signals around the globe, and much more.

Official GW-7900 Specs / Features *for base version GW-7900B-1

  • Full-Auto Illuminator
    Automatically deactivates the Auto EL backlight function when surrounding light is sufficient, and activates it under dim light or dark conditions.
  • Shock-resistant
    Shock-resistant construction protects against impact and vibration.
  • Solar Power
    A solar cell provides power for operation.
  • Radio signal reception (EU, USA, Japan, China)
    Whether in Europe, North America and Japan or in the outer reaches of Canada, Central America and China – once the watch has been set to the local time, it receives the relevant signal and shows the correct time wherever you are. In many countries, it also sets itself automatically to summer and winter time.
  • Moon Phase Indicator
    The moon phase indicator shows the current moon phase based to the earth
  • Tide indicator
    Once the high tide time has been entered for a selected location, the watch can display the low and high tide phases at this location on any given date. This can be quite useful, for example, if you want to know the patterns of the tides at your destination in advance.
  • World time function
    Displays the current time in major cities and specific areas around the world.
  • Stopwatch function – 1/100 sec. – 24 hours
    Elapsed time, split time and final time are measured with 1/100-sec accuracy. The watch can measure times of up to 24 hours.
  • Timer – 1/1 min. – 24 hours
    For fans of precision: the countdown timers help you to remember specific or recurring events by giving off an audible signal at a preset time. The time can be set to the nearest minute and up to 24 hours in advance. Ideal for people who need to take medicines every day or those who do interval training.
  • 5 daily alarms
    The daily alarm reminds you about recurring events with an acoustic signal at the time you have set. This model has 5 independent alarms for flexible reminders of important appointments.
  • Snooze feature
    Each time you stop the alarm, it sounds again after a few minutes.
  • Button tones on/off
    The button tones for using the mode button can be turned off. This means that the watch no longer beeps when switching from one function to another. Preset alarm or countdown timers remain active when the button tones are deactivated.
  • Automatic calendar with Date, Day and Month
    Once set, the automatic calendar always displays the correct date.
  • 12/24-hour timekeeping
    Times can be displayed in either a 12-hour or 24-hour format.
  • Mineral glass
    The tough mineral glass resists scratching.
  • Resin case
  • Resin band
    Synthetic resin is the ideal material for wrist straps thanks to its extremely durable and flexible properties.
  • Buckle
  • Battery level indicator
    An indicator shows the current battery level.
  • Water resistance classification (20 bar)
    Perfect for free diving without scuba gear: the watch is water resistant up to 20 bar according to ISO 22810.
  • Dimensions (H x W x D)
    52,40mm x 50,00mm x 17,70mm
  • Weight
    approx. 71,00 g

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Famous people wearing G-Shock GW-7900!

Actor Michael B. Jordan is wearing G-Shock GW-7900

Have you seen this watch with another person? Let us know!

Enjoy Japanese Unique Features in GW-7900!

*some images are about G-Shock 5000/5600 cases, but the technology, approaches, concepts and philosophy remains the same for the whole G-Shock Model Range

Hollow case structure. Based on a realization that “shocks are not transmitted inside a bouncing rubber ball,” the structure was designed to let the module float inside the case, relieving shocks transmitted from outside. Today, the module’s shock resistance is realized through further technical innovations. But the revolutionary tough structure that gave G-SHOCK its origin began here.

All-directional covering. If the watch is dropped, the protruding bezel fully enclosing it absorbs the shock, protecting the buttons directly connected to the module and alleviating shocks from all directions. The bezel also guards the surface of the crystal. The band is curved stiffly at the point of connection with the case, moreover, enabling it to serve as a shock absorber and prevent direct shocks to the back of the case.

Protective cushioning of key parts. The crystal oscillator and other critical parts inside the module are guarded individually by cushioning material. Any strong shock to the watch causes immediate distortion of the cushioning inside the module, preventing contact failure and malfunction.

Japan Quality. Constructed with genuine quality, CASIO products provide truly practicable applications in which functionality and beauty combine. The leading-edge LSI technologies and skilled craftsmanship that give life to CASIO watches exemplify the quality Japan boasts in the world marketplace.
For CASIO, “faith in manufacturing” refers to an inexorable advancement of digital technologies and an uncompromising commitment to fine craftsmanship. This faith engenders unparalleled performance that not only elevates CASIO watches as close as possible to perfection, but that actually changes their wearers’ lifestyles.

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*we composed all points based on our ten years experience in writing about CASIO watches. We know what matters when you are searching for your ideal G-SHOCK!

– Solar Powered (Tough Solar). No need to worry about the battery change
– Radio Control Accuracy (corrects the time if needed via radio signals)
– Functional and informative display
– Timeless design Large, ribbed buttons (designed for comfortable use, even with gloves)
– Frost-resistant display ( -20°C, making it suitable for winter sports and cold regions)
– Two independent stopwatches
– Moon Phase Indicator
– Tide graph (tide level for specific date and time)

– Plastic-like appearance
– Oversized (52.4 × 50 × 17.7 mm while traditional watch size is 48.9 × 42.8 × 13.4 mm (DW-5600)
– Forecasting information may not be very accurate

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GW-7900 Comparison Table with similar G-Shock Watches


Price (Amazon)

Year of first Release





±15 seconds per month

Radio-controlled (via atomic watch signals)

 ±15 seconds per month

SmartWatch Features





LED Backlight

Full-Auto Illuminator

Electro-luminescent backlight


5 alarms (daily or one-time)

5 daily alarms

5 independent multi alarms


Measuring unit: 1/10 second
Input range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments)

1/1 min. – 24 hours

Input range: 1 minute to 24 hours
Unit: 1 second
Other: Auto-repeat


1/100-second stopwatch
Measuring capacity: 23:59’59.99”
Measuring modes: Elapsed time, split time, 1st-2nd place times

Stopwatch function – 1/100 sec. – 24 hours

1/100-second stopwatch
Measuring capacity: 23:59’59.99”
Measuring modes: Elapsed time, split time, 1st-2nd place times

Hourly Time Signal




World Time

31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city / World time city swapping

Displays the current time in major cities and specific areas around the world

29 time zones (27 cities), city code display, daylight saving on/off

Data Memory




Moon Graph




Tide Graph




Case / bezel material



Resin / Stainless steel


Mineral Glass

Mineral Glass

Mineral Glass


7 years on CR2025

Solar Powered CTL1616

10 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




Full features (if you want to know more)

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GW-7900 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 GW-7900 (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 58$ on eBay →
starting from 26$ on PacParts →

Recent News about GW-7900 

All G-SHOCK GW-7900 News →

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You ask, we answer…

What does Tough Solar in GW-7900 mean?

CASIO’s original solar-charging system converts not only sunlight but also light from fluorescent lamps and other sources into power.

How does Radio-controlled Watch in GW-7900 work?

This is additional way for time sync. This watch receives time calibration radio signals that keep the displayed time accurate.

What does Tide graph in GW-7900 mean?

It means tide level for specific date and time.

Not sure about GW-7900? There are more G-Shocks!

Back to All G-Shock Models →


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