UP TO 4 TIMES BRIGHTER AND LASTS UP TO 50 YEARS - New super bright feature makes this unique ISOBrite Watch 4 times brighter than standard tritium watches and the illumination will last TWICE as long than other brands T25 watches. Size and illumination of the watch makes it easy to read.Isobrite ISO303 Valor Series yellow dial watch is the first T100 tritium lightweight polycarbonate watch. Features anti reflective sapphire crystal, ten year lithium battery, two tritium markers on bezel and 20 ATM water resistance. The T100 tritium markers are the brightest available in the market. Zippered travel case with extra nylon band.Why do T100 watches last so much longer than T25 watches?The Isobrite T100 watches contain approximately four times the amount of tritium gas as the T25 watches do (i.e.: Luminox, Traser, MTM). The higher volume of tritium gas results in a much brighter visible illumination combined with a much longer life span of illumination. The Isobrite T1...