The Casio G-Shock GST-B400-1AER is a men's watch featuring a carbon-reinforced stainless steel case measuring 46.6mm in height, 49.6mm in width, and 12.9mm in thickness. It is powered by a solar quartz movement and offers functions such as Bluetooth connectivity, world time, stopwatch, countdown timer, and five daily alarms. The watch is water-resistant up to 200 meters and includes a resin strap with a buckle clasp. The dial is black with a Neo-display for low-light visibility, and the crystal is made of mineral glass. Reference number: GST-B400-1AER.