4.5'' overall. Water resistant. Impact resistant. Weapon mountable. 1000 max lumens with 1.5 hour runtime. 200m beam distance. Independently operating push-button switch or remote pressure switch. Safe off feature. Concentrated beam with optimum peripheral illumination. Securely attached to long guns with MIL Standard 1913 rails. Includes: rail lcoating keys, tail cap switch, remote pressure switch, and mounting clips. Requires (2) CR123A batteries (included). Aluminum construction. Color: Black. Boxed with hanging tab. May not ship to Australia. May not ship Post Office.