When the lights go out your sidearm doesn?t need to be left in the dark. Tritium 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! Unmatched visibility in low-light shooting conditions or complete darkness Glows-in-the-dark Utilizes quality Swiss tritium for maximum brightness No batteries required FORTRESS FINISH provides a permanent protective coating for maximum protection Snag resistant design Fits standard holsters