The fastfire iii reflex sight is light small and tough placing a powerful bright red dot on the target.It has three manual brightness settings and an automatic brightness setting with a top-mounted battery (cr1632) and upgraded windage and elevation adjustments.The steel body construction is for extreme durability and is water and shock proof.The ultimate cqb sight is great for mounting on a pistol shotgun or rifle.This 3moa model includes the picatinny mount.Battery: CR1632Magnification: 1xObjective: 21x15mmField Of View: UnlimitedEye Relief: UnlimitedDot Size: 3 MOALength: 1.90"Weight: 1.50 ozFinish: Black MatteReticle: Illuminated Red FastFire DotAdjustment Size: 1 MOAProofs: Waterproof/ShockproofOptic Coating: Multi-CoatedWindage Elevation: Adjustable