・Shock-resistant structure ・Carbon core guard structure ・20 ATM water resistant ・Mobile link function ・CASIO WATCHES compatible, neobright, world time, stopwatch, timer, 5 time alarms, time signal, double LED light, fully automatic calendar, operation sound ON/OFF switching function, power saving function (displays after a certain period of time in dark places) Turn off the power to save power.・Battery indicator display ・Hand retraction function (if the hands overlap with the LCD display and are difficult to see, the hands can be temporarily retracted from above the LCD display) ・12/24 hour display switching ・Date display (Month/day display switching)/Day of the week display (switching between 6 languages: English, Spanish, French, German, Italian, and Russian) Case (length x width x thickness): Approx. 48.5 x 45.4 x 11.9mm Belt arm circumference: Approximately 14.5-21.5cm Accessories: Instruction manual (English) G-SHOCK original box Casio G-Shock Analog Digital 2100 Series Bluetooth Solar Men's Watch GA-B2100-1A1DR CASIO G-SHOCK ANALOG-DIGITAL 2100 SERIES All Black ◆The octagonal form of the GA-2100, which inherited the design concept of the first generation G-SHOCK, remains the same. , equipped with smartphone link and tough solar. In order to cope with the increase in the number of parts due to higher functionality, we have developed a thin module with optimized board layout. By combining it with the carbon core guard structure, it maintains the size of the previous model. This is an all-black model with a minimalist coloring. Recommended for outdoor scenes and casual style. It can be used by all ages, from students to working adults to adults, and is also recommended as a gift for birthdays, anniversaries, Father's Day, 60th birthdays, etc. Domestic model number: GA-B2100-1A1JF