Waterproof/Fogproof. Shock-resistant. Special range finding and trajectory compensating reticle. Generous 4" eye relief. Fully-coated lenses provide maximum brightness, clarity and contrast. Rubber eye-guard. Fingertip windage and elevation adjustment under screw down caps. Durable leaf spring for windage and elevation adjustments. One-piece tube made of aircraft quality aluminum. Durable, scratch-resistant, non-reflective matte finish. Compact and light weight.