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