NCStar's Small Tube Reflex Optic has tactical-styling 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 Weaver/Picatinny-type 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 flip-up lens covers, CR2032 3v Lithium batteries, and mounting tools.