The Rolex Sea-Dweller 4000 is a professional dive watch with a water resistance of up to 4,000 feet (1,220 meters). It features a helium escape valve, a unidirectional bezel, and a Chromalight display for readability in low light. Made from corrosion-resistant Oystersteel, it combines durability, precision, and Rolex’s signature elegance, making it ideal for serious divers and watch enthusiasts.