The UTG 4.2" ITA Red/Green CQB Dot with QD Mount, Riser AdaptorFeatures:- Great Field of View and Unlimited Eye Relief - Clear and Sharp 4.0 MOA Dot Sight - No-Reflection High Tech Emerald Coatings - Red or Green Dot Adapts to Any Environmental Background - Optimal Height Design to Co-witness with Iron Sights - Includes Both Smart Adaptor & Straight-up Quick Detachable Tactical Mount with Innovative Quick Detach Mounting Deck to Use on Any Picatinny Rail- Patterned Illumination Rheostat with Variable Brightness Levels Offers Stealthy and Infinitely Fine Adjustment - Aim and Instant Lock On Target to Enhance Shooting Accuracy and Performance - Most Versatile Dot Sight for Wide Range of Pistols, Shotguns & RiflesSpecifications:- Magnification: 1X- Tube Diameter: 38mm- Objective Diameter: 32.5mm- Field of View @ 100 yards: 100'- Eye Relief: Flexible- Exit Pupil: 26mm- Click Value @100 yards: 1/2"- Length: 108mm- Weight: 7.1 oz- Parallax Setting: Infinity- Batteries: CR1620 3V