Details Casio G-Shock Watch GM-S2100-3A is based on the 2100 series, features premium quality construction and durable build. This includes simple and slim construction with beautiful colouring and a metal-clad octagonal bezel design. The watch is 200m water resistant, shock resistant and offers a carbon guard structure for a rugged environment. Featuring Double LED illumination, the watch has an Auto light switch with selectable illumination duration (1.5 seconds or 3 seconds) and afterglow. Other features of the watch include shock resistant, grey ion-plated bezel, 31 time zones, 5 Daily Alarms, Hourly Time Signal, 1/100 second stopwatch, Countdown Timer and 3 years of battery life.