The twm-852xl tactical weapon-mounted long gun light uses a cree led rated 850 lumens for 2.5 hours providing a beam distance of 245 meters.The rear facing single switch provides both momentary and constant-on lighting operation.Designed to securely attach to a long gun picatinny rail the ip-x7 rated waterproof housing is constructed from aircraft-grade 6061-t6 aluminum.The twm-852xl comes preinstalled with one set (2) cross-rail inserts.Comes with an allen wrench and 2 cr123 lithium-metal batteries.Material: 6061 T6 AluminumType: Weapon LightOutput: 850 LumensBulb Type: Cree LEDBody Diameter: 1.5"Oal: 3.50"Weight: 4.50 ozBattery: CR-123Proofs: Waterproof Impact ResistantColor: BlackHead Diameter: 1.20"For Series: Long Gun Picatinny RailRechargeable: NoSwitch Type: Push Button Tail