Vortex Crossfire 1x21mm Reflex Red Dot Sight, 2 MOA Green, Black, CF-GD2

The Vortex Crossfire 1x21mm Reflex Red Dot Sight, 2 MOA Green, Black, CF-GD2 Color: Black, Magnification: 1 x, Objective Lens Diameter: 21 mm, Reticle: 2 MOA, Illumination Type: LED, Illumination Color: Green, Eye Relief: Unlimited, Adjustment Click Value: 1 MOA, Parallax: Free, Optical Coating: Fully Multi-Coated, Battery Type: CR2032, Battery Life: 50000 hours, Water Resistance Level: Waterproof, Shockproof: Yes, Fogproof: Yes, Length: 2.5 in, Weight: 4.59 oz, Lens Type: Spherical.