Eotech's Vudu 1-10x28 offers a robust 34mm one-piece aircraft grade aluminum tube and single-piece eyepiece that includes a removable throw-lever for fast changes in magnification. The low profile elevation turret includes a push/pull locking system and a capped windage turret for a secure zero. The illuminated, glass-eteched reticle and first focal place design allows for distance estimation at any magnification and lighting condition. Specifications: First Focal Plane Overall Length: 10.63" Weight: 21.3oz Magnification: 1-10x Tube Diameter: 34mm Objective Diameter: 28mm Power Source: CR2032 Eye Relief: 1x: 3.27" to 3.90" 10x: 3.35" to 3.62" Field of View at 100 Yards: 1x: 116.6ft 10x: 11.7ft Country of Origin: Japan SR-4 MOA Reticle The SR-4 incorporates the iconic Eotech illuminated speed ring along with a hashmarked inner crosshair reticle that uses MOA subtension lines for ranging holdover and wind compensation. With a 1 MOA center aiming dot, the clean sight picture provides improved down range visibility while still allowing the full use of the horizontal and vertical stadia line for hold-overs and wind calls Adjustment Graduation per Click: 0.25 MOA Adjustment Graduation per Rotation: 40 MOA Total Elevation Travel: 100 MOA Total Windage Travel: 80 MOA