UTG 4.2" ITA Red/Green T-Dot with QD Mount, Riser Adaptor ITA dot sight 1x magnification 32.5mm objective lens diameter 38mm tube Red or green dot 100' field of view @ 100 yds Flexible eye relief 26mm exit pupil 7.1 oz. 4.25" long Battery = CR1620 3V Other features: Intuitive Quick to Acquire Red/Green T-Dot Reticle for Swift Execution of T-Zone and Center Mass Hits Fine Adjustment Rheostat for Variable Intensity Adjustment Non-reflective Emerald Coated Lens Optimal Height to Co-witness with Iron Sights Using Included Riser Adaptor Offset and Center Height Adjustable, Easily Adapts to Both the Shooter and Firearm Integral sunshade Quick-detach Weaver/Picatinny mounting deck + riser Fits Weaver/Picatinny rail