Function: 1X40 Red/Green Dot,Wide field of vision

fit for: 20mm Picatinny Rail

Magnifier: 1x

Objective lens: 40mm

Eyepiece: 40mm

Material: aluminum

Dot Color: Red/Green

Brightness level: 5 levels

Zero value: 1 MOA

Field of view: 107' at 100 yards

Parallax: Parallax Free

Battery type: 1x Cr2032

Length: 118mm

Coating of the multi-layer lens.