High tech fiber optic gunsight design. Provides superior accuracy when shooting moving targets. Eliminates dominant eye crossover. Uni-Dot is a breakthrough in optical gun sight technology. Its revolutionary design utilizes a special fiber optic rod which channels light down a narrow tube along the sight plane of the shotgun. A bright red or green fluorescent dot can be seen only when the gun is properly mounted and aligned with the shooter's aiming eye. Uni-Dot enables shooters to aim with both eyes focused on the target by providing (for the aiming eye only) a bright fluorescent dot that is perfectly aligned with the barrel. Comes with 4 light sticks.