Traditional photoluminescent compounds require light to charge the paint before it will glow. ProTek's USMC Carbon Dive Watch instead uses self-powered Pro-Glo illumination system that involves filling micro gas tubes with tritium gas. The resulting glow lasts for decades and is 100X brighter than conventional lume. It's used to light the watch's hour markers, hour, minute, second hand, and bezel pip, ensuring readability in any lighting condition, including complete darkness. Its 42mm case and tight 60-click unidirectional timing bezel are crafted from carbon composite, with a 316L embossed stainless steel screw-in caseback and crown. It's powered by a dependable Miyota quartz movement with a 10-year battery, has a date window at 3 o'clock, and sits on a genuine rubber strap with a signature steel buckle.