The GM-2100B-4ADR (also known as GM2100B-4) is a men's timepiece from Casio's G-Shock collection. It is a timepiece designed for outdoor and active use that is rugged and durable. The GM-2100B-4ADR's Stainless Steel case and Resin Strap give it an elegant and fashionable appearance. The metal case provides enhanced protection for the inner workings of the timepiece. The watch features a mineral crystal, which is scratch- and impact-resistant. This ensures that the dial remains legible even in harsh environments. Overall, the Casio G-Shock Mineral Crystal Metal Covered GM-2100B-4ADR combines a rugged design with dependable functionality, making it an ideal timepiece for individuals with an active lifestyle who require a durable and versatile timepiece.