The TWM-854XL Xtreme Lumens Tactical Weapon-Mounted Long Gun Light with Remote Pressure Switch uses an LED rated 850 lumens. Working in conjunction with a high-efficiency deep parabolic reflector it creates a usable beam of light rated at 245 meters. This weapon light attaches to a Picatinny Rail of a long gun to operate the momentary-on or constant-on lighting modes. The housing is constructed from aircraft-grade 6061-T6 aluminum. Package includes light with remote pressure switch installed with pressure pad (8 cable). rail connector. alcohol pad.2 adhesive-backed hook & loop mounting strips. 1 set (2) of spare cross-rail inserts and cross-rail mounting screws. Allen wrench. and two CR123 batteries.(Not compatible with rechargeable batteries.)