Traser® H3 watch is a robust, reliable Swiss made quality product with an unsurpassed readability in darkness, standardized according to military specifications. trigalight® are small, airtight sealed glass tubes coated on the inside with a luminous substance. The coating is “fired” with electrons emitted by the tritium gas which causes the layer to light up - a result of decades of research and development work in the field of radio luminescence. trigalight® are independent of a battery or charging by sunlight, maintenance-free and have a guaranteed lifespan of at least 10 years. Read more about the traser H3 story.