Introducing new color variations to the lineup of slim G-STEEL GST-B400 models with new, improved designs made possible by a thin module and carbon core guard structure. There is a standard model in this lineup, the all-silver color GST-B400D.
The GST-B400 is made possible by even further miniaturization of its parts and thinning of its modules without sacrificing any Bluetooth or solar function. Power consumption has also been significantly reduced.
In addition, the carbon core guard structure of this model helps to make it the thinnest of the G-STEEL Series (as of Apr 2021) while maintaining a high level of impact resistance. The thickness from the back cover to the bezel top is only 12.9 mm, which is more than one millimeter less than the GST-B100 model.
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The ideal companion for your active everyday life — a colorful G-SHOCK with step tracker to help you stay moving. The sporty look features a color block design that brings cool spring and summer colors to the octagonal design with a sportswear fabric pattern to perfectly accent your style. Buttons add an additional colorful touch, with metallic printing on the watch glass for a hint of sophisticated texture. This compact timepiece comfortably fits even slimmer wrists. Key resin components used in the bezel, band and more are made with bio-based resin. Produced using renewable organic resources, this material is expected to help reduce environmental impact. Not just cool and classy, these watches deliver when it comes to function, too. Start walking and the motion-sensing accelerometer counts your steps automatically. The watch displays total daily steps, as well as progress toward goals. Tracked data sent to a dedicated app helps you easily manage life log data. In turquoise, coral orange, or versatile white for effortless casual styling. -
The ideal companion for your active everyday life — a colorful G-SHOCK with step tracker to help you stay moving. The sporty look features a color block design that brings cool spring and summer colors to the octagonal design with a sportswear fabric pattern to perfectly accent your style. Buttons add an additional colorful touch, with metallic printing on the watch glass for a hint of sophisticated texture. This compact timepiece comfortably fits even slimmer wrists. Key resin components used in the bezel, band and more are made with bio-based resin. Produced using renewable organic resources, this material is expected to help reduce environmental impact. Not just cool and classy, these watches deliver when it comes to function, too. Start walking and the motion-sensing accelerometer counts your steps automatically. The watch displays total daily steps, as well as progress toward goals. Tracked data sent to a dedicated app helps you easily manage life log data. In turquoise, coral orange, or versatile white for effortless casual styling. -
The ideal companion for your active everyday life — a colorful G-SHOCK with step tracker to help you stay moving. The sporty look features a color block design that brings cool spring and summer colors to the octagonal design with a sportswear fabric pattern to perfectly accent your style. Buttons add an additional colorful touch, with metallic printing on the watch glass for a hint of sophisticated texture. This compact timepiece comfortably fits even slimmer wrists. Key resin components used in the bezel, band and more are made with bio-based resin. Produced using renewable organic resources, this material is expected to help reduce environmental impact. Not just cool and classy, these watches deliver when it comes to function, too. Start walking and the motion-sensing accelerometer counts your steps automatically. The watch displays total daily steps, as well as progress toward goals. Tracked data sent to a dedicated app helps you easily manage life log data. In turquoise, coral orange, or versatile white for effortless casual styling. -
Empower yourself with pink. This powerfully pink lineup features stylish, monochromatic, subtly nuanced designs that exude individuality. No sticky sweet pinks here, just high-impact strength. Featuring a bright pink with a matte finish for a soft look, the simply styled bezel and band are versatile enough to coordinate with any outfit. The deep pink of the face adds a pop of color that pulls the design together for a watch that projects focus and strength. Key resin components used in the bezel, band, and more are made with bio-based resin, a material produced using renewable organic resources that is expected to help reduce environmental impact. -
World time 5 World time 39 time zones (39 cities +coordinated universal time), daylight saving on/off, Home city/World time city swapping, auto summer time (DST) switching Stopwatch 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) Measuring modes: Elapsed time, split time, 1st-2nd place times Timer Countdown timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments) Alarm/hourly time signal 5 daily alarms (with 1 snooze alarm) Hourly time signal Light LED backlight (Super illuminator) Full auto LED light, selectable illumination duration (2 seconds or 4 seconds), afterglow Light color LED:White Calendar Full auto-calendar (to year 2099) Mute feature Button operation tone on/off Energy saving feature Power Saving (display goes blank to save power when the watch is left in the dark) Battery display/alert Low battery alert Run time Approx. battery operating time: 10 months on rechargeable battery (operation period with normal use without exposure to light after charge) 22 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge) Accuracy Accuracy: ±15 seconds per month (with no signal calibration and mobile link function) Other features 12/24-hour format Date/month display swapping Day display (days of the week selectable in six languages) Regular timekeeping: Hour, minute, second, pm, month, date, day Time adjustment details Time Calibration Signals Station name: DCF77 (Mainflingen, Germany) Frequency: 77.5 kHz Station name: MSF (Anthorn, England) Frequency: 60.0 kHz Station name: WWVB (Fort Collins, United States) Frequency: 60.0 kHz Station name: JJY (Fukushima, Fukuoka/Saga, Japan) Frequency: 40.0 kHz (Fukushima) / 60.0 kHz (Fukuoka/Saga) Station name: BPC (Shangqiu City, Henan Province, China) Frequency: 68.5 kHz Time calibration signal reception Auto receive up to six* times a day (remaining auto receives canceled as soon as one is successful) *5 times a day for the Chinese calibration signal Manual receive The latest signal reception results -
Out of stock
Features:- Vibration resistant
- Shock Resistant
- Mineral Glass / Spherical 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®)
- Digital compass Measures and displays direction as one of 16 points Measuring range: 0 to 359° Measuring unit: 1° 60 seconds continuous measurement Hand indication of north Magnetic declination correction Direction calibration (2-point calibration, figure eight calibration, auto calibration)
- Altimeter Measuring range: –700 to 10,000 m (–2,300 to 32,800 ft.) Measuring unit: 1 m (5 ft.) Hand indication graph of altitude differential Manual memory measurements (up to 14 records, each including altitude, date, time) Auto log data (High/low altitudes, cumulative ascent and descent) Others: Relative altitude readings (±100 m /±1000 m), selectable measurement interval: 5 seconds or 2 minutes (1 second for first 3 minutes only) *Changeover between meters (m) and feet (ft)
- Barometer Measuring range: 260 to 1,100 hPa (7.65 to 32.45 inHg) Measuring unit: 1 hPa (0.05 inHg) Hand indication of pressure differential (±10 hPa) Atmospheric pressure tendency graph (last 20 hours or last 56 hours) Barometric pressure tendency information alarm (beep and arrow indicates significant changes in pressure) The atmospheric pressure tendency graph can show the last 20 minutes or last 56 minutes of measurements. The hand indication of pressure differential shows values in units of ±1 hPa. *Changeover between hPa and inHg
- Thermometer Measuring range: –10 to 60°C (14 to 140°F) Measuring unit: 0.1°C (0.2°F) *Changeover between Celsius (°C) and Fahrenheit (°F)
- Step count using a 3-axis acceleration sensor: 0 to 999,999 step count display range Power Saving: Auto sensor sleep state entry after fixed period of non-activity
- World time 38 time zones (38 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping
- Sunrise, sunset time display Sunrise time and sunset time for specific date
- 1/100-second stopwatch 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) Measuring modes: Elapsed time, split time, 1st-2nd place times
- Countdown timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 second to 24 hours (1-minute increments and 1-hour increments)
- 5 daily alarms
- Hourly time signal
- Hand shift feature
- Full auto-calendar (to year 2099)
- 12/24-hour format
- Button operation tone on/off
- Regular timekeeping: Analog: 3 hands (hour, minute (hand moves every 10 seconds), second) Digital: Hour, minute, second, am/pm, month, date, day
- Accuracy: ±15 seconds per month (with no mobile link function)
- Approx. battery life: 2 years on CR2025
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The sky’s the limit! Introducing the GRAVITYMASTER GR-B300, a piece of aviation-inspired professional gear designed to work even in the harshest environments, from the G-SHOCK MASTER of G line. The GR-B300 features a Carbon Core Guard structure, which delivers the shock-resistance, rigidity, and corrosion-resistance of carbon material used in aircraft fuselages. The carbon fiber-reinforced resin case and the seamless bezel design inspired by next-generation aircraft come together in a bold and powerful form. Envision the world through a pilot’s eyes with the flight log memory function for recording current location and time, as well as dual-time simultaneously displaying the time in two time zones. In addition, simply tap on the app to instantly switch between the time back home and local time — a practical function to make traveling abroad that much smoother. Large, dimensional index marks and a metal bezel accentuating the large watch face exude functionality, enhancing the visibility that is so important for pilots, whose job demands intuitive reading of time. The rotary disc indicator at the 9 o’clock position uses a dual-coil motor to ensure smooth rotation and functional beauty. The indicator not only rotates to display alarm on/off and stopwatch; it functions as a battery level indicator as well. The high-contrast black and white color scheme dotted with color accents on the dial and buttons evokes the look of a cockpit instrument panel, while dark color variations express the practical functionality of an aviation worldview. Key resin components used in the case, bezel, and band are made with bio-based resin, a material expected to help reduce environmental impact. -
The sky’s the limit! Introducing the GRAVITYMASTER GR-B300, a piece of aviation-inspired professional gear designed to work even in the harshest environments, from the G-SHOCK MASTER of G line. The GR-B300 features a Carbon Core Guard structure, which delivers the shock-resistance, rigidity, and corrosion-resistance of carbon material used in aircraft fuselages. The carbon fiber-reinforced resin case and the seamless bezel design inspired by next-generation aircraft come together in a bold and powerful form. Envision the world through a pilot’s eyes with the flight log memory function for recording current location and time, as well as dual-time simultaneously displaying the time in two time zones. In addition, simply tap on the app to instantly switch between the time back home and local time — a practical function to make traveling abroad that much smoother. Large, dimensional index marks and a metal bezel accentuating the large watch face exude functionality, enhancing the visibility that is so important for pilots, whose job demands intuitive reading of time. The rotary disc indicator at the 9 o’clock position uses a dual-coil motor to ensure smooth rotation and functional beauty. The indicator not only rotates to display alarm on/off and stopwatch; it functions as a battery level indicator as well. The high-contrast black and white color scheme dotted with color accents on the dial and buttons evokes the look of a cockpit instrument panel, while dark color variations express the practical functionality of an aviation worldview. Key resin components used in the case, bezel, and band are made with bio-based resin, a material expected to help reduce environmental impact. -
The sky’s the limit! Introducing the GRAVITYMASTER GR-B300, a piece of aviation-inspired professional gear designed to work even in the harshest environments, from the G-SHOCK MASTER of G line. The GR-B300 features a Carbon Core Guard structure, which delivers the shock-resistance, rigidity, and corrosion-resistance of carbon material used in aircraft fuselages. The carbon fiber-reinforced resin case and the seamless bezel design inspired by next-generation aircraft come together in a bold and powerful form. Envision the world through a pilot’s eyes with the flight log memory function for recording current location and time, as well as dual-time simultaneously displaying the time in two time zones. In addition, simply tap on the app to instantly switch between the time back home and local time — a practical function to make traveling abroad that much smoother. Large, dimensional index marks and a metal bezel accentuating the large watch face exude functionality, enhancing the visibility that is so important for pilots, whose job demands intuitive reading of time. The rotary disc indicator at the 9 o’clock position uses a dual-coil motor to ensure smooth rotation and functional beauty. The indicator not only rotates to display alarm on/off and stopwatch; it functions as a battery level indicator as well. The high-contrast black and white color scheme dotted with color accents on the dial and buttons evokes the look of a cockpit instrument panel, while dark color variations express the practical functionality of an aviation worldview. Key resin components used in the case, bezel, and band are made with bio-based resin, a material expected to help reduce environmental impact. -
Whatever you’re doing, wherever you are — the G-SHOCK Master of G line has your back. For total support in the harshest environments, this GRAVITYMASTER watch delivers peak performance in punishing conditions in air. It features bold black to exude toughness and a band in the same bright yellow used for emergency rescues and safety signs. This innovative design is a sure fit for the world of professionals involved in rescue efforts and other critical missions. The organic form of the GRAVITYMASTER GR-B300RY is inspired by next-generation aircraft and rendered with a seamless exterior design. The Carbon Core Guard structure and wide 3D face deliver durability, readability, and a comfortable fit. Enjoy all the practical functions as well, including dual-time simultaneously showing the time in two cities, a flight log memory function for recording routes traveled, and more. This tough watch delivers what you need to make quick decisions and take decisive action in the harshest of environments. -
Features
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The GST-B500 line brings together smaller components and high-density mounting, continuing to deliver Bluetooth connectivity and solar power charging, but in an even slimmer profile. The Carbon Core Guard absorbs external shocks for true G-STEEL toughness, and the comfortable fit complements your unique way of life. Downsized button guards offer slim yet ample buttons that are easy to operate. The bezel is treated with multiple finishes to deliver exceptional metal textures from every angle, for a truly sophisticated presentation with its own special look.
DB-36-1AVDF 
MTD-125D-1A3VDF 
LTP-V006D-7BUDF