WildCatCarson's WildCat is a compact 521mm binocular designed with children in mind. It's lightweight and compact design is perfect for small hands. The WildCat is focus-free eliminating the need for complex focusing. The 5x power magnification is very manageable and easy for children to use. Real glass optics provide a crisp sharp image. Features a built-in oil-filled compass. Specifications Model: HU-521Magnification: 5xObjective Lens Diameter: 21mm Minimum Focusing Distance: 15 mPrism Type: BK-7Field of View: 430 feet @ 1000 yardsWeight: 5.1 oz.Accessories: Pouch Case and Strap