This new G-SHOCK model GA2100HD-8A is a part of the new G-SHOCK Hidden Glow Series, the design inspiration drawn from the hidden talents we all possess but rarely show off. This stylish grey, black and white look is constructed with a phosphorescent face that glows a vibrant bright green in the dark. Known for their continuous innovation, effortless toughness, and beauty this timepiece upholds that, offering functionality to its best ability with seamless design. Discover these watches hidden identity in the dark and be wowed by its eccentric luminescent features. - 48.5 × 45.4 × 11.8mm Case Size - 51g Weight - Carbon/Bio-based Resin Case and Bezel - Bio-based Resin Band - Shock Resistant - Carbon Core Guard structure - 200 Meter Water Resistance - Approx. battery life: 3 years on SR726W X 2 - Mineral Glass - World time: 31 time zones (48 cities coordinated universal time), daylight saving on/off - Stopwatch - Timer - Alarm/hourly time signal: 5 daily alarms - Double LED light *LED 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) - Calendar: Full auto-calendar (to year 2099) - Mute feature: Button operation tone on/off - Accuracy: ±15 seconds per month - 12/24-hour format - Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents.) - Regular timekeeping: *Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (day) *Digital: Hour, minute, second, pm, month, date