Casio GA100-1A4 men's G-Shock anti-magnetic x-large G watch carries a case diameter of 51mm and a case thickness of 17mm. Featured on this model is a fixed bezel, textured function pushers. The caseback on the Casio GA100-1A4 is with four screws, maintaining the 200 meters water resistance. The strap is crafted in black resin and is secured using a buckle clasp. This dress watch has a black dial with indexes hour markers. Casio GA100-1A4 comes with auto LED light with afterglow, world time in 29 time zones (48 cities +UTC ), daylight saving on/off, home city/world time swapping. Countdown timer with a measuring unit: 1 second and input range: 24 hours, countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments) with auto-repeat. 1/1000 second stopwatch with a measuring capacity: 99:59'59.999", measuring modes: elapsed time, split time, Others: Speed (0-1998 units/hour), Selection distance input (0.0-99.9). Hourly time signal, auto calendar (pre-programmed until the year 2099), 4 daily alarms and 1 snooze alarm, 12/24 hour formats, accuracy: +/-15 seconds per month. Battery: CR2025. Approximate battery life: 7 years. Protecting the dial is a mineral crystal designed to resist scratches. Powering this stylish watch is a Japanese made quartz movement.