The BAK4 high refractive index prism has bright, clear images and a sharp contrast that gives you all the details of the object. Complete Multiple Coating (FMC): multiple lens fully coated with anti-reflective green film for excellent light and brightness transmission while improving contrast and resolution. Top Gift Choice: Suitable for both, fit for hunting, hiking, expl, viewing, sailing, bird watching, concert, outdoor sports etc. It is wonderful to be a gift on Father's Day and Children's Day. It's your best gift choice. Adjustable Eye Width and Dual Focus: Variety of eye widths makes them suitable for both. Easily use the central focus wheel and dioptre adjusting ring to focus on your targets. And the binoculars can pull down the rubber eyepieces and fit glasses wearer. Particularly suitable for outdoor activities such as mountaineering, hiking, driving, wildlife viewing and scenic appreciation.