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: 24x34mmEye Relief: UnlimitedDot Size: 3 MOALength: 3.20"Weight: 5.20 ozFinish: Black AnodizedReticle: Illuminated Red/Green 4 PatternProofs: Waterproof/ShockproofOptic Coating: PlatinumWindage Elevation: Adjustable