The Luminox Manta Ray Steel is built for durability and readability, tailored for practical use. It features a 45mm stainless steel case and case back, complemented by a CARBONOX™ unidirectional ratcheting bezel and a dark blue dial. Water-resistant up to 100 meters, the watch comes with a black PU strap and a stainless-steel signature buckle. The Luminox Light Technology ensures self-powered visibility at night, with illumination lasting up to 25 years. - Swiss Quartz - Approximately 50 Months Battery Life - Constant glow for up to 25 Years - 45mm Case Size - 13mm Case Thickness - Stainless Steel Case - Polyurethane Strap - Mineral Crystal - 100 Meters Water Resistant