The TWM-850XL Xtreme Lumens? Tactical Weapon-Mounted Light uses an LED rated at 850 lumens working in conjunction with a high-efficiency deep parabolic reflector to create a usable beam of light rated at 245 meters. This weapon light features a unique and completely ambidextrous Dual Dependent Toggle Switch on each side of the light to operate the momentary-on and constant-on lighting modes. The housing of the TWM-850XL is constructed from aircraft-grade 6061-T6 Aluminum with a Glass-filled Nylon Polymer battery door and toggle switches. Power comes from two included CR123 batteries. (Not compatible with rechargeable batteries.) Specifications: Xtreme Lumens: Yes Multi-Function: Yes Flashlight Lumens: 850 Beam Distance: 245 m Candela: 15,000 Drop Rating: 2 m Dust/Water Rating: IP-X7 Waterproof Flashlight Runtime: 1.75 Length: 3.75 in (95 mm) Width: 1.5 in (38 mm) Depth: 1.5 in (38 mm) Weight: 5.4 oz (155 g) Head Diameter: 1.2 in (30 mm) Light Source: LED Case Material: Aircraft-grade 6061-T6 Aluminum w/Type III Hard Anodized Finish Body Color: Black Quantity of Batteries: 2 Power Source: CR123 Lithium batteries Package Contents: Light, modular rail inserts & screws, Allen wrench, 2 CR123 Lithium batteries US Patent: 9,713,217 US Patent: 10,451,384 Warranty: Limited Lifetime