All Traser H3 watches feature trigalight technology (Gaseous Tritium Light Sources - GTLS), the same advanced illumination used by top manufacturers like Marathon, MWC, and Luminox. This technology makes these watches among the easiest to read in low light or complete darkness. Unlike conventional luminous watches, trigalight does not require a battery or external power source and never needs recharging or servicing. Guaranteed for 10 years, this self-sustaining illumination on the dial and hands makes Traser H3 watches perfect for military personnel, emergency services, and outdoor adventure enthusiasts.