Description The OMNI-4 is a precision reflex sight with a unique inverted design. This unconventional approach to an open sight limits the exposure of the lens to dirt and maintains the device&';s functionality even when it is raining. The compact sight has unlimited eye relief, fully multi-coated optics and a high-efficiency bright red LED that guarantees exceptional battery life. It is both shockproof and splashproof for added durability. Specs Description Bresser OMNI-4 Red Inverted Reflex Sight Item Number 23-20400 Reticle Color Red Size of Dot 4 MOA Battery Life 500 Hours Battery CR2032 (Not Included) Brightness 0-11 Magnification 1x Eye Relief Unlimited Elevation Adjustment 30 MOA Mount Picatinny or Weaver Weight 0.3 LBS Parallax 30 Yards Adjustment Value 1 inch @ 100 YDS, 1 MOA Per Click Water Resistant IP55 Splashproof Dimensions 3.0 X 1.3 X 1.7" Manual Download Instruction Manual Here Warranty Limited USA Five Year Warranty once registered within 60 days of purchase. Click Here to register. CA Residents: Prop 65 WARNING(S)