LED illuminator and red laser for long range targeting. 100 lumens. 89m beam distance. Three modes of operation: White light (1h runtime), White light/red laser (1h runtime), Red laser only (11h runtime). Ambidextrous operation. Fits GLOCK 26, 27, and 33 subcompact handguns. Windage and elevation screws mounted in brass brushings. Operating temperature range: -20F to 120F. Batteries replaceable with unit mounted on handgun, no resight necessary (batteries included).