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 Black plastic resin and titanium case with rubber strap and buckle. Black dial with white hands and Arabic numeral markers on inner and raised dials. Rotating bezel. Day and date display. 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. Scratch resistant mineral crystal. Water resistant to 200m. Screw-down crown to insure movement integrity. Precise Swiss Quartz movement. Case measures 45mm diameter by 13mm thickness.