The Casio G-Shock GA400GB-1A9 combines robust durability with contemporary design in a black plastic construction. This watch features a highly reliable quartz movement that ensures precise timekeeping. With a water resistance of 200 meters, equivalent to 20 ATM pressure resistance, it withstands professional marine activities and surface water sports. The 10 mm case diameter provides a prominent presence while ensuring comfortable wear. Mineral glass offers excellent scratch resistance and clear visibility of the dial. The black plastic case and strap ensure lightweight comfort and shock resistance, characteristic of the G-Shock series with its shock-resistant build. This model upholds the brand's reputation for watches that endure demanding conditions while offering practical functionality. The unidirectional bezel allows for timing operations, and the digital-analog display provides multiple timekeeping options. Luminous hands and markers ensure readability in low light conditions. The buckle mechanism guarantees a secure fit during active use. Designed for individuals seeking a robust watch that combines technical performance with everyday versatility, this model is suitable for various activities from outdoor adventures to daily wear. The black colorway offers versatile styling that complements both casual and sport-oriented outfits. Casio's engineering focus on durability and reliability makes this watch ideal for those who value long-term performance in their timepieces.