NcSTAR VDUO434DGB Duo Series Scope/Green Dot Reflex Sight, 4X 34mm N/A Imported Glass etched reticle with blue Illumination 1-1/2 inch LED (light emitting diode) reticle 100 percent safe for the eyes Five brightness settings for both the blue reticle and green dot Electronic Control panel for reticle and green dot optic: on/off and brightness levels