This is the Casio G-SHOCK Mudmaster a Master of G - Land Watch Features: World time World time 38 time zones (38 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping Sunrise/sunset display Sunrise, sunset time display Sunrise time and sunset time for specific date Stopwatch 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 Timer 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) Alarm/hourly time signal 5 daily alarmsHourly time signal Light 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) Light color LED : White Calendar Full auto-calendar (to year 2099) Mute feature Button operation tone on/off Accuracy Accuracy: 15 seconds per month (with no mobile link function) Other features 12/24-hour formatHand shift featureRegular timekeeping: Analog: 3 hands (hour, minute (hand moves every 10 seconds), second) Digital: Hour, minute, second, am/pm, month, date, day Basic Information Case size - (Lx Wx H) 55.4 x 51.3 x 19.4 mm Weight - 92 g Case and bezel material - Case / bezel material: Carbon / Resin Band - Resin Band Construction Shock Resistant, Mud Resistant, Carbon Core Guard structure Water resistance - 200-meter water resistance Power supply and battery life - Approx. battery life: 2 years on CR2025 Dual layered case back Conquer tough terrain and grab attention with a rugged timepiece boasting a bold, eye-catching color scheme. Designed to work even in the harshest environments, MASTER of G specialty watches take timekeeping to new heights with a rugged design accented in the bright yellow used for emergency rescues. The GGB100 MUDMASTER employs high rigidity carbon in the case to keep damage and warping at bay and ensure extreme airtightness and shock resistance. This timepiece also features a filter to protect against mud, a stainless steel panel back, and a back cover made of shock-resistant fine resin embedded with glass fibers, giving it a high level of resistance to dust and mud. The bezel also uses three layers of fine resin with carbon fiber inserts. This tough, rugged design is accented in bright bold yellow. Practical and functional, this watch is equipped with digital compass, altimeter/barometer, thermometer and step counter. Easily correct the time using the dedicated G-SHOCK app, and tap into loads of other useful features including the Mission Log, which automatically records altitude data obtained from the watch and route data obtained by your smartphone.