A traser H3 watch is a Swiss made quality product with an unsurpassed readability in darkness. The trigalight illumination of a traser H3 watch is independent of a battery and does not need sunlight for charging. A traser H3 watch is robust, reliable, and 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 cause the layer to light up (conversion of the electric charge to light). With a trigalight, the necessary electrons are created through the radioactive disintegration of tritium (an isotope of hydrogen). Features Stainless steel case and link bracelet with fold over push button deployment clasp. Black patterned dial with silver tone hands and Arabic numeral markers. MB-Microtec H3 tritium Illumination in the hands and hours provides long lasting, self activated light in any darkness, providing clear time unsurpassed by any other timepiece. 30min chronograph measures in 1sec increments. Date display. Scratch resistant sapphire crystal. Water resistant to 300m. Screw-down crown maximizes water protection. Precise Swiss Quartz movement. Case measures 45mm diameter by 12mm thickness.