The TWM-854XL Xtreme Lumens(TM) 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 and loop mounting strips, 1 set of spare cross-rail inserts and cross-rail mounting screws, Allen Wrench and 2 CR123 batteries. (Not compatible with rechargeable batteries.) Specifications: Xtreme Lumens: Yes Multi-Function: Yes Beam Distance: 245 m Drop Rating: 2 m Switch Function: Momentary or constant-on Length: 3.75 in (95 mm) Width: 1.5 in (35 mm) Depth: 1.5 in (35 mm) Weight: 5.4 oz (142 g) Case Material: Aircraft-grade 6061-T6 Aluminum w/Type III Hard Anodized Finish Quantity of Batteries: 2 Power Source: CR123 Lithium Primary Batteries