The SureFire M600B Scout Light is a lightweight, powerful incandescent WeaponLight that mounts securely to any Mil-Spec Picatinny rail in seconds via an integral thumbscrew clamp. The M600B's compact, lightweight incandescent head (1.0" diameter) generates 60 lumens white light for 1.25 hours on a set of two SureFire lithium batteries. Pre-focused bean produces enough reach for CQB and shorter range applications, with enough surround beam to accommodate an operator's peripheral vision. The incandescent head can be fitted with an IR filter for use with night vision equipment. The Scout Light can be positioned anywhere on a Picatinny rail, using a minimal amount of space and leaving room for other accessories. The light is activated by clicking the tailcap button or, for fingertip control without altering your grip on the weapon, by installing the pressure-sensitive tape switch (included) at your preferred position on the weapon. - Constructed of hard-anodized aerospace-grade aluminum, tempered Pyrex glass, and O-ring sealed to keep out dust, dirt, and moisture. The durable Scout Light has been battle-tested and is built to withstand the rigors of combat. - M600B Scout Light includes: Scout Light WeaponLight w/ M75 thumbscrew Picatinny rail mount and compact incandescent head, two 123A SureFire lithium batteries, click-on/off tailcap, 7" tape switch, alcohol prep pad, Velcro attachment pads, and user manual.