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CASIO G-Shock GGB100-8A Gray Black Mudmaster Carbon Watch
The case is made of high-rigidity carbon material to protect against damage and deformation due to impact and other rough treatment. A filter further protects against the invasion of mud, for the high level of dust and mud resistance required when in severe environments. In addition, the dual back cover consists of a stainless steel panel back and an outer cover made of shock resistant fine resin embedded with glass fibers.

Quad Sensor capabilities use compact sensors that make it possible to pack compass, altitude/barometer, and temperature measurements, along with an accelerometer that keeps track of your step count, into a compact configuration.
Altitude measurement and the step count are used to perform consumed calorie calculations that take up and down grades into consideration, and to record the results in an activity log.

You can use the app to enable or disable modes individually so only enabled modes appear. You can even specify the sequence to be used when displaying the modes.

Mud resist structure (dust-resistant, mud-resistant)
Quad sensor (Thermometer, Altimeter/Barometer, Digital Compass, Step Counter)
Super Illuminator auto double LED light for face and digital display illumination
Case / bezel material: Carbon / Resin　
Resin Band
Neobrite
Mineral Glass
Carbon Core Guard structure
Mud Resistant
Shock Resistant
Spherical Glass
200-meter water resistance
Double LED lightLED 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 compassMeasures and displays direction as one of 16 pointsMeasuring range: 0 to 359°Measuring unit: 1°60 seconds continuous measurementHand indication of northMagnetic declination correctionDirection calibration (2-point calibration, figure eight calibration, auto calibration)
AltimeterMeasuring range: –700 to 10,000 m (–2,300 to 32,800 ft.)Measuring unit: 1 m (5 ft.)Hand indication graph of altitude differentialManual 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)
BarometerMeasuring 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
ThermometerMeasuring 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 rangePower Saving: Auto sensor sleep state entry after fixed period of non-activity
World time38 time zones (38 cities coordinated universal time), daylight saving on/off, Home city/World time city swapping
Sunrise, sunset time displaySunrise time and sunset time for specific date
1/100-second stopwatch00'00''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 timerMeasuring unit: 1 secondCountdown range: 24 hoursCountdown 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 timekeepingAnalog: 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

Case Size: 55.4mm x 53.1mm x 19.3mm