Sightmark Citadel 5-30x56mm Rifle Scope Illuminated LR2 Reticle 30mm Tube Aluminum Black Specifications and Features: Sightmark Citadel 5-30x56mm SM13040LR2 Rifle Scope Long Range First Focal Plane 5-30x Magnification 56mm Objective Lens 30mm Tube 21.7'/5x field of view at 100 yds 3.6'/30x 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 11 Mil Adjustment Range Adjustable Parallax 20 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 14.9" Weight 27.5 oz