Beileshi Compact Binocular Telescope 10X Magnification Optical Lens Beileshi 10x25 Series compact binoculars are perfect for those who need advanced optical performance packed in a lightweight, compact design so you can carry in a pocket and use them for hours without tire; With BaK4 prisms and multi-coated lenses; Beileshi 10x25 impressive light transmission and always delivers crisp, clear images. O-ringed sealed and nitrogen-charged; Waterproof and fog proof to take on the outdoors. Beyond the impressive optical performance; It is incredibly compact and lightweight yet also provides an offset, large focus wheel for more comfortable adjustment and no-slip armor.