SVBONY SV-21 Binoculars 10x42 Compact Multi Coated Roof Prism with Twist-up Outdoor for Shooting Hunting Bird Watching Hiking Traveling Concerts 10x42;10x magnification and 42mm objective lens;increase the light transmittance;deliver a slightly higher mid range magnification in a compact design with 42mm objectives;it's comfortably facilitate a wide field of view to get bright and clear image BK-7 prisms increases contrast and resolution for sharper;crisp viewing more detailed images;multi coated optics for improved light transmission through the optical path for brighter and more clear images Twist-up eye cups;adjustable eye cups twists up or down;effectively eliminate stray light interference;offers a pure view experience and achieves comfortable viewing with or without eyeglasses Multi function for shooting;hunting;bird watching;camping;hiking;backpacking;traveling;concerts;sporting events;outdoor adventures;fishing;boating and other wild life Lifetime warranty;we confidently promise lifetime warranty for each one from us