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.syi