2-element Achromatic Objective Lens For Superb Imaging Capability Multi-coating Enhances Light Transmission Reduces Flare Glare Stray Light Lotutec Coating Sheds Water Dirt Grease Grime Lenses Can Be Wiped Clean Without Smearing Partial Rubber Armoring For A Secure No-slip Grip polycarbonate Housing Is Lightweight & Resilient Nitrogen Filledwaterproof Fog-proof Submersible To 3ft designed For Binocular-style Viewing multi-position Twist-up Lockable Eyecup For A Custom Fit 1300yd Range Accuracy:=600m (1m > 600m 0.5%) 1-touch Activation Button Activates LED Display That Appears In The Center Of The Fov led Readout Automatically Adjusts Brightness Level For Enhanced Visibility Against Ambient Lighting Conditions Built-in Ballistic Information System Program Calculates Holdover Value To Match Specific Cartridgesreadout Is Visible In The Fov