Welcome to Tone-on-Tone G-SHOCK ƒ?? watches devoted to the monochrome aesthetic, down to the finest detail. The GA-2100 clothes its iconic form in tone-on-tone style, available in three popular colors ƒ?? turquoise, white, and volt yellow. The case, bezel, band, and even the individual dial components are finished in subtly different shades of the same color for a monochromatic look that boasts surprising depth and dimension. These colorful watches make a great accessory for your street-savviest fashion. Case / bezel material: Carbon / Bio-based resin Bio-based resin band Mineral Glass Shock Resistant Carbon Core Guard structure 200-meter water resistance Double LED lightLED light for the face (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)LED backlight for the digital display (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)LED:White Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents) World time, 31 time zones (48 cities + coordinated universal time), daylight saving on/off 1/100-second stopwatchMeasuring capacity: 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 timerMeasuring unit: 1 secondCountdown range: 24 hoursCountdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments) 5 daily alarms Hourly time signal Full auto-calendar (to year 2099) 12/24-hour format Button operation tone on/off Regular timekeeping: Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (day), Digital: Hour, minute, second, pm, month, date Accuracy: ¶ñ15 seconds per month Approx. battery life: 3 years on SR726W X 2 Size of case : 48.5 Ç? 45.4 Ç? 11.8 mm Total weight : 51 g