Description
CASIO G-SHOCK GDG-B100-1A3JF MASTER OF G - LAND MUDMAN
The CASIO G-SHOCK GDG-B100-1A3JF brings green styling, a high-contrast MIP LCD and Bluetooth Smartphone Link to the MASTER OF G - LAND MUDMAN collection. This battery-powered Japanese Domestic Market model combines shock, dust and mud resistance with practical training and notification functions.
Bumper Guard Design and Mud-Resistant Construction
Protective exterior: Inspired by the protective structures of off-road vehicles and survival gear, the bumper guard design surrounds the center case with a multi-faceted bezel and a back protector. Interlocking bezel and band components strengthen the connection between the two.
MUDMAN protection: A carbon-fiber-reinforced resin case helps resist deformation, while gaskets around the button shafts help prevent mud and dust from entering. The case back features the MUDMAN mole character.
MIP LCD with Red LED Backlight
Clear digital display: The memory-in-pixel LCD presents time and training data with high contrast, including in bright outdoor conditions.
Nighttime visibility: A red LED backlight assists reading in darkness while helping preserve the eyes' adaptation to low light. Auto light and selectable 1.5-second or 3-second afterglow settings add convenience.
Bluetooth Smartphone Link
Connected timekeeping: Pair the watch with a compatible smartphone through the CASIO WATCHES app for automatic time adjustment, convenient watch settings and phone finder.
Notifications and vibration: Supported smartphone notifications include incoming calls, email and social updates. Vibration alerts can also notify you of training targets. Connected functions depend on smartphone compatibility, app settings and Bluetooth connectivity.
Step Tracking and Training Functions
Activity measurement: An acceleration sensor supports step tracking and calculates distance, speed and pace. Training functions also include calorie estimates, automatic or manual laps, auto pause and customizable data screens.
Smartphone-assisted distance correction: The watch can use a paired smartphone's GPS data to correct distance calculations. Training and activity data can be transferred to the app for review.
Interval training: A timer with up to five time settings supports repeat intervals. World time, a stopwatch and four alarms with snooze provide additional everyday utility.
Battery Power and Bio-Based Resin
Replaceable-battery operation: The specified battery life is approximately 2 years. Without smartphone time synchronization, accuracy is rated at ±15 seconds per month.
Materials and fit: Bio-based resin is used in the main resin components of the case, bezel and band. The watch measures 63.6 × 49.6 × 16.2 mm, weighs 66 g and accommodates wrist sizes from 145 to 215 mm. Mineral glass and 20 bar water resistance complete the construction.
Japanese Domestic Market Model
Japan-market reference: GDG-B100-1A3JF is the Japanese Domestic Market reference. JDM identifies the intended sales market and does not indicate the country of manufacture.
Key Highlights
- MUDMAN construction: Shock, dust and mud resistance with Carbon Core Guard.
- MIP LCD: High-contrast digital display with red LED backlight.
- Bluetooth connectivity: CASIO WATCHES app support, automatic time adjustment and notifications.
- Training support: Step tracking, pace and distance calculations, lap recording and interval timing.
- Battery-powered: Approximately 2 years of specified battery life.
- Green styling: Bio-based resin band and 20 bar water resistance.
Product Specifications
| Brand / Collection | CASIO G-SHOCK |
|---|---|
| Series | MASTER OF G - LAND / MUDMAN |
| Model | GDG-B100-1A3JF |
| Market | Japanese Domestic Market |
| Watch Type | Men's digital watch |
| Display | Memory-in-pixel (MIP) LCD |
| Color | Green |
| Case Material | Carbon-fiber-reinforced resin with bio-based resin |
| Bezel | Bio-based resin; bumper guard design |
| Case Dimensions | 63.6 × 49.6 × 16.2 mm (length × width × thickness) |
| Weight | 66 g |
| Crystal | Mineral glass |
| Case-Back Detail | MUDMAN mole character engraving |
| Band / Bracelet | Bio-based resin band |
| Compatible Wrist Size | 145–215 mm |
| Movement Type | Battery-powered quartz with Bluetooth Smartphone Link |
| Battery Life | Approximately 2 years |
| Accuracy | ±15 seconds per month without smartphone time synchronization |
| Compatible App | CASIO WATCHES |
| App-Linked Functions | Automatic time adjustment; watch settings; approximately 300 world time cities; notifications; activity and life logs; smartphone GPS distance correction; phone finder |
| Training Functions | Acceleration-sensor-based distance, speed and pace calculations; calorie estimates; automatic/manual laps; auto pause; target alerts; customizable training display |
| Life Log | Daily step count and monthly running distance |
| World Time | 38 cities in 38 time zones plus UTC; automatic daylight saving setting; time-zone data may be updated through smartphone linking |
| Stopwatch | 1-second measurement; 100-hour capacity; split time |
| Interval Timer | Up to five time settings; 1-second increments; maximum setting of 60 minutes; auto repeat |
| Alarms | Four time alarms with snooze |
| Light | Red LED backlight with auto light and selectable 1.5-second/3-second afterglow |
| Additional Functions | Vibration alerts; full-auto calendar; date/day display; 12/24-hour format; airplane mode; operation tone and vibration on/off; display-off function |
| Protective Construction | Shock resistance; dust and mud resistance; Carbon Core Guard |
| Water Resistance | 20 bar |
| Release Date in Japan | October 16, 2026 |
| JAN Code | 4549526430633 |