The Manta Ray Steel is built for durability and readability, ideal for practical use. It showcases a dark blue dial within a 45mm stainless steel case and case back and features a CARBONOX™ unidirectional ratcheting bezel. With water resistance up to 100 meters, it is fitted with a stainless-steel mesh band 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 and Mesh Band- Mineral Crystal - 100 Meters Water Resistant