When the lights go out, your sidearm doesn't need to be left in the dark. TRITIUM PRO night sights transition from standard white dot sights during the daylight, to glowing green dots in the dark. Tritium does not need batteries and does not need to be charged with light - it simply glows!Features:Front sight FOCUS LOCK(TM) ring for even faster focusAngled rear sight edge for emergency one-hand operationUnmatched visibility in all shooting conditions 24/7Compact design maintains factory sight radiusAssembled in the U.S.A. with quality Swiss tritium for maximum brightnessGlows in the dark 24/7 - No batteries or light exposure requiredFits most standard holsters