NCStars Small Tube Reflex Optic has tacticalstyling and an unlimited eye relief for flexible mounting. The red green and blue LEDs are 100 safe for the eyes and the rheostat knob has three brightness settings for each color. It is constructed with a black anodized aluminum body and a platinum lens coating. This optic features a 30mm cantilever mount compatible with WeaverPicatinnytype rails and secured with a thumb nut. It has a centerline height of 1.5 above the rail popular with AR15 platforms. It includes ocular and objective flipup lens covers CR2032 3v Lithium batteries and mounting tools.