The he403r-gd (gold dot) is a 20mm micro sight designed for rifle and carbine applications.He403r-gd features a rotary switch to select reticle intensity, holosuns gold super led with 50k hour battery life, and a 2moa dot with 10 daylight and 2 night vision compatible reticle intensity settings.The he403r-gd housing is made from durable cast aluminum and includes both a lower 1/3 co-witness mount (1.63) and a low mount (.75) for low-comb height rifle applications.Additional features include shake awake technology, rubber lens covers, and a battery compartment integrated into the rotary switch for the 2032 battery.He403r-gd is a versatile sight for users of all levels.Battery: CR2032Magnification: 1xObjective: 20mmField Of View: UnlimitedEye Relief: UnlimitedDot Size: 2 MOATube Diameter: 20mmLength: 2.75"Weight: 3.53 ozFinish: Black AnodizedReticle: 2 MOA Gold DotAdjustment Size: 0.50 MOAProofs: IP67 WaterproofOptic Coating: Multi-CoatedWindage Elevation: Adjustable