The TWM-852XL Xtreme Lumens tactical weapon-mounted long gun light uses an LED rated 850 lm for 1.75 hr providing a beam distance of 245 m. 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.). Features: LED technology Single switch functionality Momentary or constant-on flashlight Sharp focused beam for distance illumination Light comes pre-installed with 1 set (2) cross-rail inserts Allen wrench (included) Aircraft-grade 6061 T6 aluminum housing with Type III hard anodized finish IPX7 waterproof Impact and chemical resistant Serialized for personal identification Limited lifetime warranty Drop rating - 2 m