There is no brighter tritium-illuminated watch in the night than Isobrites Valor T100 Silicone-Strap Watch. While normal wrist watches with tritium illumination have T25 tritium, the Valor is four times brighter, boasting T100 so you can tell the time in any light. Swiss Rhonda 715Li Quartz movement is powered by a 10-year lithium-ion battery for a decade of accurate timekeeping. Polycarbonate case houses the antireflective scratch-resistant sapphire crystal lens. Water-resistant to 200 meters. Case dia: 47mm. Wt: 2 oz. Colors: Black, Yellow, Tan. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Analog Watches.