The red four reticle reflex optic by ncstar features reticle choices of dot bullseye cross and starburst.The led is 100% safe for the eyes and there is unlimited eye relief for flexible mounting.The rheostat knob allows the user to choose from 7 brightness settings and the optic is powered by one 3v lithium battery (cr2032 or equivalent).This optic features a black anodized aluminum body a rubber lens cover and a built-in weaver-type mount for installation on weaver or picatinny-type rails.Battery: CR2032Magnification: 1xObjective: 24x34mmField Of View: 15.7 m @ 100 mEye Relief: UnlimitedDot Size: 3 MOALength: 3.10"Weight: 4.30 ozFinish: Black Hardcoat AnodizedReticle: Illuminated Red 4 PatternAdjustment Size: 1 MOAProofs: Waterproof/ShockproofOptic Coating: RubyWindage Elevation: 1 MOA