SureFire X400 Ultra Series LED WeaponLights w/Built-in Laser Sight, TIR Lens Virtually indestructible ultra-high-output LED delivers 600 lumens of blinding white light; produces tactical-level light for 1.75 hours on a set of batteries TIR lens shapes versatile beam with enough reach and surround light for close- to longer-range tasks 5mW (505nm) Class IIIa red laser sight is highly visible to the human eye and rarely needs re-zeroing Hard-anodized aluminum body, tempered window, and O-ring and gasket seals make light rugged, durable, and weatherproof.Integral aluminum T-slot mounting system offers rock-solid attachment to railed hand guns and long guns equipped with MIL-STD 1913 rails FITS: Handguns and long guns with Picatinny or Universal rails