Cvlife Tactical Red Green Dot Sight With Cantilever Mount Specification -- Color: Black -- Weight: 308g -- Tube Dia: 40mm -- Length: 120mm -- Objective Dia: 35mm -- Magnification: 1x -- Field of View @ 100 yards: 60° -- Eye Relief: Flexible -- Exit Pupil: 80mm Features -- 5 illumination intensity, the dot sight is bright enough to see on a sunny day or at night. -- The dot sight is easy to zero by the windage adjustment and elevation adjustment -- The dot sight comes with lens cover and mount, the mount fits for 20 mm rails. -- Full metal construction, the dot sight is waterproof and fogproof. -- Long battery life, it comes with one CR2032 battery. Package included -- 1 x Dot Sight with Lens Cover -- 1 x CR2032 Battery -- 1 x Cantilever Mount -- 1 x Allen Wrench -- 1 x Cleaning Cloth -- 1 x Operation Instruction