TruGlo Tritium Fiber Optic Sight (1911 Models, .260 Front / .450 Rear)When the lights go out, your sidearm doesnt need to be left in the dark. The TruGlo Tritium Fiber Optic Sight easily transits from standard white dot sights during the daylight, to glowing green dots in the dark. The Tritium does not need batteries and does not need to be charged with light, it simply glows!