Traser h3 watch classic aurora gmt silver bracelet classic aurora gmt silver bracelet all traser h3 watches feature trigalight tritium gaseous light illumination technology this highly specialised technology was developed by mb microtec where a guaranteed light source was needed for safe operations in all hazardous environments and conditions trigalight are tiny glass vials that are laser sealed internally coated with phosphorescent material and filled with a minute amount of tritium gas