Casio G-Shock x GA-2100 Series ft. Luminescent Men Casual Sports Hexagon 200m Water Resistant Watch GA-2100HD-8A GA2100HD GA2100 GA-2100 GA-2100HD Discover a timepiece that shines a light on your inner strengths. This innovative design features luminescent accents on a dark gray base, symbolizing the untapped talents within us. Experience the mesmerizing glow in the dark and uncover a watch that's as unique as you are. Module / Movement 5611 (quartz) Battery Life / Accuracy Approximately 3 years (+/-15 seconds per month) Crystal Mineral crystal Light Double LED light (super illuminator, selectable illumination duration, afterglow) Case / Band Material Carbon / resin case with resin band Water Resistance 200m / 20 bar Case Size Thickness: 11.8 mm Diameter: 45.4 mm Length: 48.5 mm Other Specifications Casio G-Shock x GA-2100 Series ft. Tough Structure Shock resistant Carbon core guard structure World time (31 time zones, daylight saving on/off) 1/100-second stopwatch (up to 24 hours, elapsed time, split time) 1-second countdown timer (up to 24 hours) 5 daily alarms Hourly time signal Full auto-calendar (to year 2099) Button operation tone on/off 12/24-hour format Hand shift feature (hands move out of the way to provide an unobstructed view of the digital display content) Regular timekeeping (analog-digital display)