Steiner 10x50 Police Binocular Rugged police binocular with 10x magnification and 50mm objective lens Built to military specs, with field-tested waterproof, fogproof, and shockproof housing BaK-4 prisms ensure optimal brightness and clarity in all light conditions Auto-focus system keeps subjects in focus from 20 yards to infinity Measures 8.2 x 2.8 x 5.2 inches (W x H x D); weighs 36 ounces