Tritium tubes are self illuminating gas tubes which contain an isotope of hydrogen

This watch has a fixed bezel and a textured push/pull main crown

revealing unexpected details such as the metal logo on the end tips and the secret HELLO SUNSHINE inscription

Men's Gunmetal Gray Mesh Chronograph Emporio Armani Watch AR1979

bringing once again to light the splendor of this versace icon: the medusa

Casio Collection Unisex Silver Watch Clasp Type_Tang Tritium tubes are self illuminatingPerfect for every traveller. This watch is splash proof and comes with World Time and a world map feature, LED light, 5 alarms, a stopwatch and is finished with an adjustable stainless steel bracelet.