TruGlo TGTG231G1XA Tritium X White Outline Tritium Front/Green Tritium Rear/Black Nitride Fortress Frame, Compatible w/Glock 42/43/43X/48 Except MOS, Front Post/Rear Dovetail Mount

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!