Feature: 1.Higher Refractive Index: Low-light night vision, the refractive index of BAK4 light is higher than that of BK7, which can effectively avoid dark edges and make the image clearer. 2.36mm Large Objective Lens: The larger the caliber, the more light entering the telescope, then imaging becomes clearer and clearer. 3.HD Optical Glass Lens: The all-optical glass lens can effectively increase the light transmittance of the lens, increase the picture clarity, and enhance the color reproduction. 4.Light and Portable: Light and small, this binocular is portable for daily use. Specification: .