Specifications: Prism: BAK4 Magnification: 100 x Eyepiece diameter: 0.39in/10mm Objective lens diameter: 0.9in/22mm Field of View @ 1,000 yds: 383ft. Optical coating: FMC(fully multicoated)green film lens Material:Eco moistureproof rubber armor Waterproof coefficient: IPX7 Item Weight: 7.0 ounces Other Key Features and Advantages： Lightweight, Robust with a modern design Ergonomic,Comfortable, Fast focuser, Easy to use Enjoy comfortable viewing even if you wear eyeglasses. Simply twist the eyecups up or down to see the full field of view How to Use: Step 1:you can fold the binoculars until it suitable for both sides of the eye. Step 2:close your right eye and rotate the center adjusting knob until the left eye is clear. Step 3:close your left eye, turn right eyepiece to clear and then you can open your two eyes Package Includes: 1x Binoculars 1x Storage Bag 1x Lens Cleaning Cloth 1x Neck Strap 1x Instruction Manual