Feyachi Reflex Sight - Adjustable Reticle (4 styles) Both Red and Green Reticle allows for 4 different styles. Dot, Circle/Dot, Crosshair/Dot, Crosshair/Circle/Dot combinations. All in one sight! A 33mm lens provides quick target acquisition. Wide field of view to maintain situational awareness. Very sturdy and secure rail mounting system. Will not come loose, made to last. Parallax corrected & unlimited eye-relief, where the dot goes, so does the bullet! Ultralight, waterproof and shockproof - Powered one 3V lithium battery (included).