Key Features and Specifications The GA-2100-7AER combines a durable design with a range of practical functions. Construction: The watch features a Carbon Core Guard structure, utilizing carbon fiber-reinforced resin for outstanding strength and impact resistance while remaining lightweight. Water Resistance: It offers 200-meter water resistance (20 bar), making it suitable for swimming and free diving without scuba gear. Design: The octagonal bezel and slim profile (11.8mm thickness) contribute to a versatile and modern aesthetic that is comfortable for everyday wear. Display: It has an analog-digital display with double LED illumination (for both analog and digital parts) and luminescent Neo-display hands for visibility in the dark. Functions: Key features include: World Time function with 31 time zones (48 cities + coordinated universal time). Stopwatch (1/100-second) and countdown timer. 5 daily alarms and an hourly time signal. Full auto-calendar (up to the year 2099). Hand shift feature that temporarily moves the analog hands to allow an unobstructed view of the digital display. Power: The watch operates on a battery with an approximate life of 3 years on 2 x SR726W batteries. GA21007AAER