Features: Durable, lightweight, anodized aluminum construction Crisp, clear red dot for quick target acquisition 11-position rheostat knob for variable brightness settings Wide field of view Unlimited eye relief, great for pistols and rifles alike Integrated 11mm dovetail mounts Specifications: Magnification 1x Objective 30mm Exit Pupil 28mm Overall Length 3.74 inches Tube Diameter 38mm Eye Relief (inches) Free Field of View (Ft. at 100 yards) 57