SureFire X300 LED WeaponLight [110 lumens | 2.4 Hours] Max Output: 110 lumens (5 times the light of a two-D-cell flashlight); continues producing tactical-level light for 2.4 hours Versatile beam is perfect for longer- and close-range applications Ambidextrous tactical switching enables fail-safe operation under fire nstantly attaches to most handguns with a Universal rail and handguns/long guns with a Picatinny rail 1.39" high by 1.43" wide by 3.53" long; weighs 3.7 ounces (with batteries)