AIM-O M21 Self-Illuminated Reflex Red Dot Sight

M21 dot.Lens diameter 30mm.Fast acquisition of the target.Material: ALUMINUM.Color: BLACK/DARK EARTH.RDS color: RED.Pattern designed to be visible in all conditions.It works in all weather and temperature conditions.Unique shape it absorbs shocks and deflects the stress away from the lenses.Auto-lighting adapts to ambient light.Calibration Settings.1x magnification.Attack fast 20mm standard.Weight: 160gr.Product Dimensions: 4.5x2x2.8 inches.Anti-reflective lenses.Operation 2x LR44 batteries & auto lighting.Cover red dot included in rubber.Coating of the multi-layer lens.Waterproof, anti-fog.Anti-reflective, scratch-resistant surfaces.