Snypex Knight 10x50 ED Tactical Law Enforcement Binoculars Armored rubber binocular with 1% fully multi-coated optics, green-coated on four sides of the prisms Fully waterproof and fog proof, nitrogen filled, submerge to 1 meter for 15 minutes & field of view at 1 yards - 39.2ft Minimum focus distance of 3.92ft & 2 mm long eye relief Prism type - open hinge/roof prism binoculars