GHT M3-Z Red/Green Dot Sight with Low Mount

Magnification: 1x Tube Diameter: 40mm Objective Diameter: 35mm Field of View: 60° @ 100yds Exit Pupil: 80mm Optical Coating: Multi-coated Length: about 122mm Fits For 20mm Picatinny Rail Mount Powered by: 1x CR2032 Battery (Not included)