Youll always know what time it is day or night with the Isobrite Eclipse Series Analog Watch with Silicone Strap. T100 tritium illumination is four-times brighter than ordinary watches that use T25 illumination. Two tritium markers on the unidirectional bezel. Accurate Swiss Ronda 715Li quartz movement. Anti-reflective scratch-resistant sapphire crystal, polycarbonate case and silicone watch band. 10-year lithium-ion battery. Water-resistant to 200 meters. Case dia: 47mm. Wt: 2 oz. Colors: Blackout/Blue Tritium, Blackout/Green Tritium. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Analog Watches.