Compact Rail Mounted Tactical LED Light. 2 3/4'' overall. Black impact resistant nylon polymer body. Dust-proof, shock-proof and waterproof construction. C4 white LED with up to 90 lumen output. Uses one CR2 lithium battery (included). Burn time up to 1 1/2 hours per battery. Features fast, safe, adjustable and secure side mounting. Key kit (included) to securely fit a broad range of weapons. Boxed with hanging tab. Lithium Metal contained inside item. May not ship to Australia. May not ship Post Office.