The Visionking 10x42 Binoculars with roof prism design, allows for a slimmer, more compact shape. And aids in a better grip and offers extra protection from rugged use and weather conditions. Precise image clarity can be achieved with the center focus knob and right hand diopter ring. It is nitrogen filled so that can eliminate inside lens from fogging. It is a ideal product for hunting and camping. Durable and protective, rubber-armored Lightweight, ergonomic design, comfortable to hold Multicoated glass lenses Long eye relief for eyeglasses wearers Smooth central focus knob for quick viewing Close focusing Specifications: : VISIONKING Item number: 10X42H Magnification: 10x Caliber: 42mm Prism glass: BAK4 Nearest sight distance: 3m Prism System: Roof Eyecup type: Twist Focusing System: Center Vision (ft/1000 yd): 330 Exit pupil diameter: 4.2mm Exit pupil distance: 18mm Package included: 1 x Telescope (with Eyepiece Cap and Objective Cap) 1 x Lanyard 1 x Lens Cloth 1 x Storage Bag 1 x Desiccant 1 x English User Manual