The Bravo4 features Megaview an advanced prism and ocular design which yields 40% greater field of view than the competitive prism-based battel sights. It features Motac immediately powers up illumination when it senses motion and powers down when it does not in order to extend battery life; low dispersion glass that provides industry leading optical clarity and red illumination with 8 daytime and 2 night vision settings. Brand Sig Sauer Electro-Optics Category Rifle Scopes Model Bravo4 Series Battle Sights Finish Black Magnification 4x Proofs Waterproof Firearm Type Rifle Reticle Illuminated Horseshoe Dot 5.56 / 7.62 Objective 32mm Length 5.80" Eye Relief 60mm Field of View 7.50 Degrees @ 100 ft Optic Coating Dielectric Weight 21.20 oz