Relations Feature A Light and Compact A Four Kinds of Reticle A Design for Real Fire Caliber A Tactical Style Specification A Magnification: N/A A Tubeless Sight Window Lens Size: 22x33mm A Mount base length: 57mm (2.2 inch) A Overall Length: 82mm (3.2 inch) A Width (without illumination knob):36mm (1.4 inch) A Height: 48mm (1.9 inch) A Weight (net):160g (5.6 ounce) A Eye Relief: Free A Parallax: 1 MOA at 80 yards A Field of View (M @ 100M):15.8 A Optics Coating: Multi coated A Reticle: 4 kinds of reticle A Elevation Range: 60 MOA A Windage Range: 60 MOA A Battery Type: 1pcs CR2032 A Stepless green and red illumination adjustment A Reticle exchange with audible click A Feature 1 MOA (50 Yards) windage and elevation A Shock proof, Rain Proof and Fog Proof A High quality aluminum alloy in durable black matte finish A With reticle lock feature A Integrated 21mm weaver mount A To exchange battery: A Use coin to loosen the cap A Take out the used battery A Exchange with 1 new pc of CR2032 button battery A Refasten the cap again A Free fitting involved: Gift package, tools and cleaning cloth