Description
CASIO G-SHOCK GDG-B100-1JF MASTER OF G - LAND MUDMAN
The CASIO G-SHOCK GDG-B100-1JF combines black styling, a high-contrast MIP LCD and Bluetooth Smartphone Link in the MASTER OF G - LAND MUDMAN collection. This battery-powered Japanese Domestic Market model pairs shock, dust and mud resistance with practical training and notification functions.
Bumper Guard Design and MUDMAN Protection
Protective exterior: Inspired by the protective structures of off-road vehicles and survival gear, the bumper guard design uses a multi-faceted bezel and back protector to surround the center case. Interlocking bezel and band components strengthen the connection between them.
Mud-resistant construction: A carbon-fiber-reinforced resin case helps resist deformation, while gaskets around the button shafts help prevent mud and dust from entering. Tread-inspired details on the face and band reinforce the functional design, and the case back features the MUDMAN mole character.
MIP LCD with Red LED Backlight
High-contrast display: The memory-in-pixel LCD presents time and training data clearly, including in bright outdoor conditions and direct sunlight.
Low-light 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 notifications include incoming calls, email, social updates, calendar events and reminders. Vibration alerts can also notify you of training targets. Connected functions depend on smartphone compatibility, app settings and Bluetooth connectivity.
Step Tracking and Training Support
Activity measurement: An acceleration sensor supports step tracking and calculates distance, speed and pace. Training functions include calorie estimates, automatic or manual laps, auto pause and customizable training data screens.
Smartphone-assisted distance correction: Distance calculations can be corrected using GPS data from a paired smartphone. After correction, the watch can calculate running distance more accurately on its own. Training and activity records 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
Battery-powered operation: The specified battery life is approximately 2 years. Without smartphone time synchronization, accuracy is rated at ±15 seconds per month.
Materials and dimensions: 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-B100-1JF is the Japanese Domestic Market reference. JDM identifies the intended sales market and does not indicate the country of manufacture.
Key Highlights
- MUDMAN protection: Shock, dust and mud resistance with Carbon Core Guard construction.
- MIP LCD: High-contrast digital display with red LED backlight.
- Bluetooth connectivity: CASIO WATCHES app support, automatic time adjustment and notifications.
- Training functions: Step tracking, distance and pace calculations, lap recording and interval timing.
- Battery power: Approximately 2 years of specified battery life.
- Black exterior: Bio-based resin components and 20 bar water resistance.
Product Specifications
| Brand / Collection | CASIO G-SHOCK |
|---|---|
| Series | MASTER OF G - LAND / MUDMAN |
| Model | GDG-B100-1JF |
| Market | Japanese Domestic Market |
| Watch Type | Men's digital watch |
| Display | Memory-in-pixel (MIP) LCD |
| Exterior Color | Black |
| Case Material | Carbon-fiber-reinforced resin; bio-based resin used in the main resin components |
| 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; smartphone 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; time and calorie target alerts; customizable training display |
| Training Log | Recorded time, distance, pace and calories burned |
| 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 setting increments; maximum setting of 60 minutes; 1-second measurement; 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; user profile settings; 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 | 4549526430732 |