The hs515gm is an open reflex optical sight designed rifle and carbine applications.Features include aluminum housing holosun's super led with up to 50k hours battery life; 12 brightness setting- 10 daylight & 2 night vision; 2 moa dot/65 moa circle; parallax free and unlimited eye relief; solar failsafe and shake awake.Includes qr and detachable mount lens cloth cr1632 battery t10 l key and user manual.Battery: CR2032 LithiumMagnification: 1xEye Relief: UnlimitedDot Size: 2 MOALength: 2.44"Weight: 7 ozFinish: Black Hardcoat AnodizedReticle: Red 2 MOA Dot/65 MOA CircleAdjustment Size: .5 MOAProofs: Water Resistant ShockproofOptic Coating: Multi-CoatedWindage Elevation: Windage/Elevation Adjustable