The Casio GBM-2100A-1A3ER is a G-SHOCK watch featuring a stainless-steel bezel and a bio-based resin band. It offers Bluetooth® connectivity for Smartphone Link and is powered by Tough Solar technology. The watch includes a green dial with luminescent hands and indices, protected by mineral glass. It is shock-resistant and water-resistant up to 200 meters. Additional features include world time, stopwatch, countdown timer, 5 daily alarms, and a double LED light for readability in low-light conditions. Reference number: GBM-2100A-1A3ER.