The Bushnell NatureView Birder Combo provides everything you need for a rewarding experience on the nature trail, including a birding the North American Bird Reference CD-ROM for positive species identification, a birding field log and high quality binoculars with a robust, field-ready build. The NatureView Binoculars offer 8x magnification with 40-millimeter objective lenses so that you can capture close-up detail, while maintaining a wide enough field of view to witness flight and other field action. The porro prism system, quality BaK-4 prisms and multi-coated optics combine to provide bright clear images. Meanwhile, the textured center-focus wheel makes it easy to pull focus quickly and accurately and the rugged, non-slip rubber armor ensures a steady grip. The combination is completed with a carrying case for the binoculars and a deluxe strap for security. Built to last, the binoculars carry a limited lifetime warranty from Bushnell.