The blue Luminox #tide ECO XS.8903.ECO series is crafted entirely from recycled #tide material for the case, strap, and bezel. It features a Swiss Made Ronda 515 quartz movement and Luminox Light Technology, which guarantees continuous illumination for up to 25 years under any lighting conditions. Additionally, the watch is water-resistant up to 200 meters.- Swiss Quartz- Approximately 50 Months Battery Life- Constant glow for up to 25 Years- 46mm Case Size- 14mm Case Thickness - 100% recycled ocean-bound plastic material Case and Strap- Sapphire Crystal - 200 Meters Water Resistant