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.Battery: CR2032Magnification: 1xObjective: 35mmEye Relief: UnlimitedDot Size: 3 MOATube Diameter: 30mmLength: 5"Weight: 8.90 ozFinish: Black AnodizedReticle: Illuminated Red/Green/BlueAdjustment Size: 1 MOAOptic Coating: Platinum