NcSTAR 1x35mm Red/Green/Blue Dot Sight with 3 MOA Dot Size, with Built in Cantilever Weaver Mount, Black Unlimited eye relief Black anodized aluminum construction Three brightness settings for the Red, Green, Blue Dots 30mm Cantilever Weaver Style Mount for mounting onto most Weaver Style/Picatinny rails Red, Green and Blue LEDs (Light Emitting Diode) 100% safe for the eyes