outdoor day and night 100x90 optical monocular hunting hiking binoculars.On the other hand, the fully coated optics provide excellent light transmission and brightness to help you see almost any targetwhether youre looking for birds or trying to get a better view.ClearField of view: With a 42 mm lens and 18.55 mm eyes, you can see 16 times closer and see more clearly and brightly.The larger the lens, the more light enters the binoculars and the brighter the image...PRISM MATERIAL, BAK4, clear image, no black bars, produces an ultra clear and crisp image.WATERPROOF, the mirror is filled with high purity nitrogen and is waterproof and fogproof.You can use it in rainy weather and wet environments and you dont have to worry about this item.Product Features.Specifications.One-handed operation.Powerful, ultra-compact and ultra-light.Ideal for enjoying the beauty of nature, bird watching, watching sports, the almighty.Focusing mode: single focus focusSystem: CentrePrism system: RoofMagnification: 12xField of view: 66M / 8000M Objective lens