This is a Twin Sensor model from the G-Shock Mudmaster Series, designed for use in extreme environments scattered with rubble, dirt and debris. With a push of one large button at the 3 o'clock position, you can check your position with its Compass. The temperature can also be measured easily by pushing the button at 4 o'clock. This model has been developed with operability in mind so that anyone can intuitively check their position using the Compass, even in the most extreme climates, without visual observation. The dust and mud-resistant button guard cylinder structure prevents fine sand and mud from getting into the buttons while also helping to absorb any shock to the buttons and improving operability. Broad hour/minute hands and indices of large Arabic numerals have also been adopted to improve visibility. This design is packed with military-style flare, including a mode display that uses a sprocket-inspired disk dial and a textured band to prevent slipping. Case size (L W H) icon-question 56.2 55.3 17.3 mm Weight 94 g Case and bezel material Resin / Stainless steel Band Resin Band Construction Mud Resistant Shock Resistant Water resistance 200-meter water resistance Power supply and battery life Approx. battery life: 2 years on SR927W X 2 Sensor feature Digital compass (NORTH) #10;Hand indication of north (20 seconds continuous measurement) #10;Measures and displays direction as one of 16 points #10;Measuring range: 0 to 359 #10;Measuring unit: 1 #10;Bidirectional calibration #10;Magnetic declination correction #10;Bearing memory Thermometer #10;Display range: -10 to 60? (14 to 140?) #10;Display unit: 0.1? (0.2?) Glass Mineral Glass Other Neobrite World time World time #10;31 time zones (48 cities + coordinated universal time), daylight saving on/off Stopwatch 1/100-second stopwatch #10;Measuring capacity: 23:59'59.99'' #10;Measuring modes: Elapsed time, split time, 1st-2nd place times Timer Countdown timer #10;Measuring unit: 1 second #10;Countdown range: 60 minutes #10;Countdown start time setting range: 1 minute to 60 minutes (1-minute increments) Alarm/hourly time signal 5 daily alarms (with 1 snooze alarm) Hourly time signal Light LED backlight (Super Illuminator) #10;Auto light switch, 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 Battery display/alert Low battery alert Accuracy Accuracy: 15 seconds per month Other features 12/24-hour format Regular timekeeping: Analog: 3 hands (hour, minute (hand moves every 10 seconds), second) Digital: Hour, minute, second, pm, month, date, day