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This mini binocular is quite suitable for Kids&Adult Bird Watching Safari Hunting Wildlife Hiking Travel Sport Sightseeing etc. ONE YEAR VALID WARRANTY: If you have any quality issue, please contract with us by email soon and we will try our best to provide satisfied customer service for you. Specifications:Material: rubber & plastic & optical glassProduct size: 9.2*6.1*4.3cm(opening width: 10.1cm)Model: 8 x 21Magnification: 8xObjective diameter: 21mm (External diameter: 30mm)Exit pupil diameter: 5.2mmExit pupil distance: 16mmEyepiece diameter: 13mm(External diameter: 28mm)Viewing angle: 6 DegreesField of view: 131m/1000mPrism material: Roof Prism, BAK9 materialOptical coating: FMC full surface multilayer coating, objective multilayer green film, eyepiece multilayer blue film Waterproof performance: Life waterproofMini focus length: 2mLens construction: 2x5E/4G XB821PPPackage Included:1 x 8x21 Binocular with strap1 x Cleaning cloth1 x Nylon Bag1 x Manual