Luminox SR-71 Blackbird Series - Chronograph Alarm Limited to 999 units worldwide Black steel PVD plated, screwed down case with soundbox caseback Case Diameter: 44 mm Black steel PVD plated, fixed bezel Black PVD plated steel, screw down case back Antireflective coated sapphire crystal Black steel PVD screw down crown Water resistant: 100 meters Ronda chronograph alarm movement 48 month battery life 23 mm black steel PVD plated bracelet with black PVD plated signature buckle and security clasp The ultimate illumination system Glows continuously for more than 25 years Glows 100 times brighter than other luminous watches Swiss illumination system is self-powered no need to push button or expose to light to activate illumination system Illumination guaranteed for 10 years Entirely Swiss made Water and Shock resistant WatchCo.com is an authorized Luminox retailer. One-year Luminox warranty.