Features      Introducing a new basic G-SHOCK brand black MUDMASTER model for the MASTER OF G Series watches with special functions for use under extreme conditions on the land, on the sea, and in the air. The extreme black and minimal coloring of this model helps to ensure that vital information is clear and easy to read, even under the harsh conditions encountered by rescue teams and others who work in extreme environments.The distinctive G-SHOCK black coloring of this model gives it a no-nonsense look of seriousSpecifications     				Case / bezel material: Resin / Stainless steel		Resin Band		Mud Resistant		Neobrite		Screw Lock Crown		Vibration resistant		Shock Resistant		Sapphire Glass with non-reflective coating		200-meter water resistance				Double LED light		LED light for the face (Full auto LED light, selectable illumination duration, afterglow)		LED backlight for the digital display (Full auto LED light, selectable illumination duration, afterglow)		Solar powered		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		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		The auto hand home position correction		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		Bidirectional calibration		Magnetic declination correction		Altimeter		Measuring range: –700 to 10,000 m ( –2,300 to 32,800 ft.)		Measuring unit: 1 m (5 ft.)		Hand indication of altitude differential		Manual memory measurements (up to 30 records, each including altitude, date, time)		Auto log data (High/low altitudes, cumulative ascent and descent)		Others: Relative altitude readings (±100m /±1000m),		Selectable measurement interval: 5 seconds or 2 minutes		*1 second for first 3 minutes only		*Changeover between meters (m) and feet (ft)		Barometer		Display range: 260 to 1,100 hPa (7.65 to 32.45 inHg)		Display unit: 1 hPa (0.05 inHg)		Hand indication of pressure differential		Atmospheric pressure tendency graph		Barometric pressure tendency information alarm (beep and arrow indicates significant changes in pressure)		*Changeover between hPa and inHg		Thermometer		Display range: –10 to 60°C (14 to 140°F)		Display unit: 0.1°C (0.2°F)		*Changeover between Celsius (°C) and Fahrenheit (°F)		World time		29 time zones (29 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping		1/100-second stopwatch		Measuring capacity: 23:59'59.99''		Measuring modes: Elapsed time, split time, 1st-2nd place times		Countdown timer		Measuring unit: 1 second		Countdown range: 60 minutes		Countdown start time setting range: 1 second to 60 minutes (1-minute increments)		5 daily alarms		Hourly time signal		Hand shift feature (manual or auto (during altitude, barometric pressure, and temperature measurement))		Battery level indicator		Power Saving (display goes blank and hands stop to save power when the watch is left in the dark)		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 signal calibration)		Approx. battery operating time:		6 months on rechargeable battery (operation period with normal use without exposure to light after charge)		25 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)