The powerful and full-featured BARSKA Colorado binoculars are perfect for all types of outdoor viewing. Large 50mm objective lens provides ample light gathering which is especially helpful at dusk or dawn. Rubber armor covering offers protection and a secure, comfortable grip. Fully coated optics with BK-7 prism coating. Wide field of view with long eye relief. Folding eyecups. Includes lens covers, carrying case, and neck strap. Limited lifetime warranty.