Dandelion 4-16x40 AOIR Rifle Scope Magnification Gun Sight 100 Yard with Double Profile 1inch Rings Mount The rifle scope is Opitcal and offers 4x to 16x magnification with a 40mm objective lens. Fully multicoated optical system by Dandelion transmits up to available light for maximum brightness throughout the day and night. Zero-reset turret with a spring-loaded adjustment knob simplifies the field adjustments. -----Illuminated Level:5 Intensity (Red) and 5 Intensity (Green). Red or green dot crosshair with front focus eyepiece adjustment helps you shooting the target fast and accurately. Battery: CR2032 x 1 (Included). Nitrogen-filled and O-ring sealed housing of the scope ensures a fog proof and waterproof performance.Hard anodizing multi-coated lenses ensure a good hand feeling and avoid scratching. Lens cover included. Magnification: 4-16X--- Objective Diameter: 40mm----Tube Diameter: 25.4mm/1 inch.---------Field of view (m):5.76-22 ---------Click Value: 0~1/4 inch @ 100 yards----------Eye Rifle (mm):74.93~77mm-------- Exit Pupil (mm):10~3.3.------------Heavy duty scope ring mounts for 20mm weaver dovetail rail only.