Sightmark Citadel 3-18x50mm Rifle Scope Illuminated LR2 Reticle 30mm Tube Aluminum Black Specifications and Features: Sightmark Citadel 3-18x50mm SM13039LR2 Rifle Scope Medium to Long Range First Focal Plane 3-18x Magnification 50mm Objective Lens 30mm Tube 36.7'/3x field of view at 100 yds 6.1'/18x field of view at 100 yds Eye Relief 3.9"-3.5"" Exit Pupil 7-2.7mm Multi-Coated Lenses LR2 Red Illuminated Etched Glass Reticle Adjustable Brightness Control 0-11 .10 Mil Adjustable Windage and Elevation 17 Mil Adjustment Range Adjustable Parallax 15 yds to Infinity Aircraft Grade Aluminum Construction Fog Proof Shock Resistant Housing Weather Resistant IP67 Standard Nitrogen Filled Anodized Matte Black Uses One CR2032 Battery Battery Life 70-100 Hours Length 13" Weight 26.1 oz