Function: 2X42 Red/Green Dot ，have 20mm rail on the top to install RMR sights or other accessories

fit for: 20mm Picatinny Rail

Magnifier: 2x

Objective lens: 42mm

Eyepiece: 30mm 

Material: aluminum

Dot Color: Red/Green

Brightness level: 5 levels

Zero value: 1 MOA

Field of view: 68 ' at 100 yards

Parallax: Parallax Free

Battery type: 1x Cr2032

Length: 140mm

Coating of the multi-layer lens.