The Shooter GLR18 features a high output LED that generates up to 180 lumens of focused brilliant white light. The Shooter GLR18 attaches / detaches to any gun with Glock or 1913 (Picatinny) rails in seconds with no tools and without putting your hands in front of muzzle. Fast, adjustable and secure side mounting to 1913 (Picatinny) and Glock- style rails; machined aluminum sealed construction with black anodized finish; waterproof to one meter for one hour and fully dust proof; ambidextrous momentary or steady on / off switch; highly accurate sight repeatability when remounting; powered by two 3-volt CR123 lithium batteries (included) with 10-year storage life; up to 2.5 hrs run time. Red-laser technology can be seen well in dark areas and night time situations. Please check your State, County and City laws for restrictions before ordering Lasers.