This is a Quad Sensor-equipped model in the G-Shock Gravitymaster Series, designed for pilots working in harsh conditions. Its structure combines a carbon fiber-reinforced resin case with a Carbon Core Guard that protects the module, offering shock resistance and fortifying the watch against vibrations. The resin that forms the bezel area has a three-layer Carbon Fiber Insert structure, making it wear-resistant. The three buttons at 3 o'clock have been designed to resemble a helicopter control stick, while also achieving ease of use. An iconic blue has been used on the dial and band to symbolize the strength and spirit of air rescue teams. Function-wise, this model comes equipped with a Quad Sensor featuring compass, altimeter/barometer, temperature reader and pedometer. It also offers time correction by linking to the dedicated G-Shock app, and the Mission Log feature allows the various data obtained by the watch to be recorded in the app. You can also use the app to set modes on/off and customize settings, including switching between displays. This is a Gravitymaster model that embodies the mobility of a helicopter along with all the functions and toughness essential for flight missions. SPECIFICATIONS: Resin Band Carbon Core Guard Structure Shock Resistant Vibration Resistant Mineral 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 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, 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 Size of case : 63x54.1x18.3mm total weight : 80g