The G1581 (GBM‑2100‑1ADR) belongs to Casio’s metal-clad GBM‑2100 series—an evolution of the iconic 2100 line that combines a stainless-steel bezel, Tough Solar charging, and Bluetooth® Smartphone Link in a sleek, octagonal design https://saicreationswatches.com/products/g1581-casio-g-shock-gbm-2100-1adr-analog-digital-watch-men