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 ring for even faster focus Angled rear sight edge for emergency one-hand operation Unmatched visibility in all shooting conditions 24/7 Compact design maintains factory sight radius