Leupold's patented motion sensor discerns any movement of the sight and automatically activates the illumination. The Auto-Brightness sensor immediately and continuously samples the current lighting conditions to provide optimal reticle intensity, precisely matching your eye's natural ability to adapt to changing lighting conditions. The extremely rugged and lightweight magnesium housing provides nimble and precise handling, while the aspheric lens generates the widest field of view and best image quality ever produced in a reflex sight. Unlimited eye relief and copious amounts of elevation and windage travel make the DeltaPoint the perfect companion for virtually any firearm.