100x180 Zoom Binoculars Day Night Vision Bak4 Prism High Power Waterproof with Case Magnification: 10-180x Objective Lens Diameter: 50mm (Available in broadband green or blue coating) Eyepiece Diameter: 17mm Field of View: 235 ft at 1000 yds; 78m at 1000m Prism: Bak4 Waterproof: Nitrogen-purged lens barrel for waterproof and fogproof performance, suitable for use in rainy or humid conditions Construction: Metal lens barrel with rubber armor for durability, comfort, and secure grip; sleek design with precise craftsmanship Focusing System: Central focusing knob with independent right-eye diopter adjustment for sharp focus at various distances Coating: Multi-layer broadband green anti-reflective coating for enhanced light transmission and clear, high-definition images Applications: Ideal for birdwatching, attending sports events or concerts, outdoor travel, and scenic viewing Maintenance Instructions: Store in a dry place to prevent internal fogging or mold. Avoid exposure to prolonged moisture. If lens surfaces become dirty, do not wipe with water. Use a cotton swab lightly dampened with alcohol to gently clean the lens. Avoid dry wiping with cloth or tissue to prevent scratching the lens coatings. Note: These binoculars feature light-amplifying night vision technology and require some ambient light to function. They are not designed to operate in complete darkness.