When success rides on the perfect shot, rely on the exceptional versatility and optical performance of Viper HD riflescopes. From predators to big game, river bottoms to the Rockies, theres a field-proven configuration for every hunting application. Ultra-rugged. Remarkably adaptable. Each member of the Viper HD family delivers outstanding image clarity, resolution, and sharpness to ensure your target comes into view with sharp detail. Viper HD also boasts enhanced features for unmatched accuracy at extended ranges while excelling in the low light of dawn and dusk when game is most active. Specifications for Vortex Viper HD 3-15x44 Rifle Scope, 30mm Tube, Second Focal Plane: Manufacturer: Vortex Objective Lens Diameter: 44 mm Magnification: 3 - 15 x Tube Diameter: 30 mm Reticle Focal Plane: Second Focal Plane (SFP) Field of View, Linear: 39.9 - 8 ft at 100 yds Eye Relief: 3.4 in Color: Black Length: 17.75 in Parallax: 20 yds to infinity Illumination Type: LED Battery Type: CR2032 Width: 3.75 in Fabric/Material: Aircraft Grade Aluminum Height: 4.5 in Optical Coating: Fully Multi-Coated Shockproof: Yes Fogproof: Yes Features of Vortex Viper HD 3-15x44 Rifle Scope, 30mm Tube, Second Focal Plane HD optical system Fully multi-coated lenses Armortek Waterproof Fogproof Shockproof Illuminated Zero system RevStop Package Contents: Vortex Viper HD 3-15x44 Rifle Scope, 30mm Tube, Second Focal Plane Neoprene Cover Sunshade Lens Cloth CR2032 Battery Custom Tool