Waterproof/fogproof and shock-resistant up to .50 caliber muzzleloader. Unlimited eye relief. Wide field of view. Fingertip windage/elevation adjustment. Eleven position rheostat for brightness control. Multi-coated lenses produce more than 95 percent light transmittance. Special anti-reflective interior finish eliminates stray or reflective light from appearing inside the sight. Integrated Weaver-style mounting system.