TruGlo's TruBrite Dual Red/Green Open Dot Sight has two choices of reticle color for the 5 MOA Dot and contrasts against any target or background. An unlimited eye relief gives a wide field of view for ultra fast target acquisition. The target side of the 34mm lens is coated for anti-reflection and is parallax free from 30 Yards. It has a integrated weaver-style mounting system and (3V-cr2032) batteries are included. This product comes in a clamshell package.