Feature a Roof Prism Open Hinge, 5 Groups 7 Lens, High Definition Binocular, Lightweight and Compact a 42mm Large Objective Lens Gives Wide Field of View, Perfect for Bird-watching and Observation a FMC with Dielectrical Coating Ensure Light Transmittance, Providing Bright and Crystal Images a IP67 Waterproof and Nitrogen-Filled to Avoid Fogged up Lens in High Moisture Environment a 10x42mm Configuration That Can Catch More Details and Brings A Better Resolution Specification Magnification: 10x Objective Lens: 42 mm Exit Pupil: 4.2 mm Eye Relief: 19 mm Min. Focal Distance: 3.5 m Lens Coating: Fully Multi-coated Prism Glass: BaK-4, Roof Prism Focus System: Center Linear Field of View: 299 ft @ yds Linear Field of View: 100 m @ 1000 m Angular Field of View: 6Adeg Diopter: Right Eyepiece Diopter Compensation: -4 to +4 Waterproof: IP67 Material: Aluminum Alloy Housing Material: Semi-Aromatic Thermoplastic Size: 150x123x114 mm Eyecups: Twist-up Weight: 711 g / 25.08 oz Items in the Package: Storage Bag, Eyepiece Cover, Objective Lens Cover, Carrying Strap, etc. Size