NCSTARA(R) RED DOT SIGHTSa LED illuminated red dot sight a 3 MOA dot size a Black anodized aluminum body a Ruby lens coating a Unlimited eye relief & FOV a 7-Position rheostat knob for multiple brightness settings a Includes integrated Weaver style mount a Powered by 3V Lithium batteries (CR2032) a Length: 6.8" a Wt.: 3.8 oz. Power 1x30mm