The gbm2100b is a 21-jewel quartz movement wristwatch designed for men, featuring a black resin case with a solid caseback. It has a sporty style with a two-piece strap and a buckle closure. The watch is water-resistant up to 200 meters and comes with Bluetooth connectivity. With its sleek black dial, white band, and black bezel, this CASIO G-SHOCK model is a stylish and functional timepiece suitable for everyday wear. The watch also includes its original box and manual, making it a great choice for those looking for a reliable and versatile timepiece.