GSTB300B-1A

G-STEEL WITH NEW CARBON CORE GUARD STRUCTURE – GST-B300

From G-SHOCK, the watch brand that is constantly setting new standards for timekeeping toughness, come new rugged style G-STEEL models that feature Carbon Core Guard structures.
This new model adopts tough G-SHOCK styling with a disk indicator at 6 o’clock that shows the current mode and charge level, and a front button that completes the overall rugged look. The disk, a round graphic digital display between 1 and 2 o’clock, and a digital display as 12 o’clock add to both functionality and looks.
The GST-B300 model comes with a resin band.

Technology

Carbon Core Guard

A new Carbon Core Guard structure for GST-B300, which protects the module with a carbon case. Highly durable carbon fiber-reinforced resin is added not only to the center case, but also to the front and side button guards, providing even stronger resistance to shocks from above or below, or from any side.

Tough Solar

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

 

Design

Bezel & Front Button

The battery indicator at the 6 o’clock position, designed to evoke a brake disk, shows the remaining battery power by an arrow pointer and a curved red bar, providing visually interesting ways to check the battery.

Resin Band

 

G-SHOCK Connected

Smartphone App (Android & iPhone)

* App screens shown here may differ from actual screens, since the app is currently under development.


– Automatic time adjustment*

– World Time for over 300 cities*

– Alarm/Timer setting

– Phone Finder


* Updating of internal data according to the latest time zone/ daylight saving time information

* The Bluetooth® wordmark and logo are registered trademarks of Bluetooth SIG, Inc. and any use of these marks by Casio Computer Co., Ltd. is under license.

* Apple, Apple logo and iPhone are trademark of Apple Inc. registered in the United States and other countries. App Store is a service mark of Apple Inc.

* IOS is a trademark or registered trademark of Cisco Systems, Inc. registered in the U.S.

* Google Play and the Google Play logo are trademarks of Google Inc.

* All other company and product names are trademarks or registered trademarks of their respective owners.

List of Countries and Geographic Areas where Product Conforms to Radio Laws or Has Been Approved.

SMARTPHONE LINK

Links with a smartphone for more accurate timekeeping and access to a host of mobile link functions.

SHOCK RESISTANT

Shock-resistant construction protects against impact and vibration.

TOUGH SOLAR

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

 

G-SHOCK CONNECTED APP

Connection with a phone requires installation of the G-SHOCK CONNECTED App on the phone.

 

  • LED Light (Super Illuminator)

    A light emitting diode is used to illuminate the face/display. Super Illuminator uses high-brightness LED for easier reading

  • Dual Time

    Simultaneous display of the current time in two different time zones

  • Daily Alarm, Hourly Time Signal

    The daily alarm sounds each day at the time you set. The value indicates how many alarms are available. The hourly time signal causes the watch to beep every hour on the hour

  • Stopwatch (1/100 24HR)

    Accurate measurement of elapsed time with the touch of a button. The fraction indicates the unit of measurement, while the time figure indicates the maximum time measurement

  • Timer (24H)

    Counts down from a start time specified by you. The value indicates the number of timers available, while the time figure indicates the maximum starting time. “REPEAT” indicates Auto Repeat, which automatically restarts timing at the end of each countdown

  • Beeper Alarm

    Beeper tone alarm sounds at the time you set

  • Full Auto-Calendar

    Allowances are made automatically for months of different lengths, including leap year

  • 12/24-Hour Timekeeping

    Times can be displayed in either 12-hour or 24-hour format

  • Battery Level Indicator

    Indicator shows the current battery level

  • Shock Resistant

    Shock-resistant construction protects against impact and vibration

  • Water Resistant (20 BAR)

    The “BAR” value indicates the number of atmospheres to which water resistance is ensured. 20 BAR means water resistance to 20 atmospheres. Watches marked “200m” have the same water resistance as 20 BAR watches

  • Mineral Glass

    Hard glass resists scratching

  • Crown

    Gold IP Screw-Lock

  • Band

    Resin

  • Case / bezel material: Resin / Stainless steel
  • Resin Band
  • Gold IP Button, Screw & Buckle
  • Mineral Glass
  • Neobrite
  • Shock Resistant
  • Carbon Core Guard structure
  • 200-meter water resistance
  • 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)
  • Tough Solar (Solar powered)
  • Mobile link (Wireless linking using Bluetooth®)
  • World time
    39 time zones*(39 cities + coordinated universal time), daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping
    * May be updated when connected to a smartphone.
  • 1/1000-second 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, 1-minute increments and 1-hour increments)
  • 5 multi-function alarms (with 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 (hand moves every 10 seconds), second),
    Digital: Hour, minute, second, pm, month, date, day
  • Accuracy: ±15 seconds per month (with no mobile link function)
  • battery operating time:
    6 months on rechargeable battery (operation period with normal use without exposure to light after charge)
    19 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
  • Module: 5631
  • Size of case: 51×50×15.5mm
  • Total weight: 82g
  • UPC: 889232286259

Carbon Core Guard structure logo

Bluetooth<sup>™</sup> logo

Smartphone App

Get It On Google Play

Smartphone App

Download on the App Store

Operation Guide (HTML)

Module No. 5631

Operation Guide (PDF)
Quick Reference (PDF)
CASIO SUPPORT ^
CASIO WATCH MANUAL ARCHIVES ^

Sign In

Reset Password

    Locate a Dealer