Two night-vision compatible illumination settings; Lower 1/3 Co-Witness Mount and Low Mount; Anti-reflective coatings on all air-to-glass surfaces provide increased light transmission for greater clarity and low-light performance; Gas purged and O-ring sealed for fogproof and waterproof performance; 2 MOA Dot Reticle - Daylight bright green dot is easy to see and paints targets regardless of lighting conditions or background