The twm-852xl xtreme lumens tactical weapon-mounted long gun light uses an led rated 850 lumens for 1.75 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.An allen wrench and 2 cr123 lithium-metal batteries and also included for quick installation and operation.(not compatible with rechargeable batteries)Material: 6061-T6 AluminumType: Weapon LightOutput: 850 LumensBulb Type: LEDBody Diameter: 1.5"Oal: 3.50"Weight: 4.50 ozBattery: CR123AProofs: Waterproof/Impact ResistantColor: Black AnodizedHead Diameter: 1.20"For Series: Long Gun Picatinny RailRechargeable: NoFilter Color: WhiteSwitch Type: Push Button Tail