The 821 binoculars have an 8x magnification and optical system, allowing for a clearer and farther view. The 12mm eyepiece and 21mm objectives also provide a wider field of view. There will be no double images or severe shaking when watching moving objects.The use of non spherical multi-layer coating optical devices and optical system ensures quality image colors and sufficient brightness during the observation process.Durables structure, odorless rubber material, with resistance to impact and antis slip grip, not easily damaged, providing a good experience in outdoor activitiesThe binoculars have a wide focusing knob that makes it easy to focus and can be used by both adults and children. The central adjustment wheel allows for easy concentration.Binoculars, binoculars for a variety of scenarios, including concerts, football, bird-watching, mountain climbing, hiking, traveling and more.