BNISE High Definition 8x56 Binoculars for Adults, Large Diameter 56mm Rugged Full-Size Compact Design for Maximum Image Brightness, with Harness Strap 8X56 MAGNIFICATION - See objects 8X closer, with a crystal clear range of view. 56mm Rugged full-size design for maximum image brightness. Phase Correction: Used on roof prism models only-coating enhances resolution and contrast. ROOF PRISM DESIGN - For streamlined shape and durability. BAK-4 PRISMS - Optimize light transmission. Fully Multi - coated Lenses: Increases light transmission to allow the most light for the best viewing experienceTwist up and down for comfortable viewing with or without eyeglasses.; CENTER DIOPTER Adjusts for differences in a user's eyes, Located on the center focus knob. WATERPROOF Optics are sealed with O-rings to prevent moisture, dust, and debris from getting inside the binocular. FOGPROOF Barrels are filled with argon gas to inhibit internal fogging. BNISE Worldwide Lifetime Warranty:100% No-Hassle Money Back Guarantee. If you're not happy with your purchase, we will give you a full refund. Satisfaction Guaranteed