Longines HydroConquest is a 42 mm automatic dive watch that pairs a black lacquered polished dial with a ceramic bezel. Designed for underwater performance, it delivers 30 bar water resistance and reliable luminous visibility. Key attributes: Black | Nero laccato lucido | Stainless steel | Water-resistant to 30 bar (300 m) | Automatic movement with ~72-hour power reserve | Swiss Super-LumiNova luminous markers | Scratch-resistant sapphire crystal | Date display | Unidirectional rotating bezel | Screw-in crown | Stainless steel bracelet with double security folding clasp and micro-adjustment | Black lacquered polished dial | Ceramic bezel | Polished stainless steel case | Dimensions & fit: Case diameter: 42.00 mm | Composition & care: Stainless steel | Ceramic | Sapphire crystal | Silicon | Rinse with fresh water after saltwater exposure. Ensure crown is screwed down before contact with water. Clean with a soft cloth. Have the movement serviced by an authorized service center as needed.