This tactical rifle scope is well suited for medium and long range shooting, with high optical clarity at 4-12x magnification and a lens diameter of 50mm. The reticle is lit in several intensities of red or green brightness and at, for an image appropriate from sight regardless of lighting or environment. The 20mm Tri-Rail built-in provide ample space for attaching multiple accessories. NOTE: without battery Specifications (Rifle scope) Dimensions: 13 “(length) x 2.5” (width) x 3 “(height) Weight: 25 oz Magnification: 4x-12x Obj. Diameter: 50mm Brightness control: Red: 5 levels / Green: 5 levels Reticle: Rangefinder Exit pupil: 10mm @ @ 12x 4x 3.3mm Field of view: 10 ‘~ 27’ @ 100 yards Eye relief: 3 “~ 3.4” Height and drift Click Value: 1/4 ‘@ 100 yards Power: 1 x CR2032 (Without)