https://vizardsgunsandammo.com/sig-sauer-electro-optics-sor52001-romeo5-1x-20mm-obj-2-moa-red-dot-black-cr2032-lithium/

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The ROMEO5 features the MOTAC Motion Activated Illumination System which increases battery life by shutting down the system when it's not in use and instantly activating the system when it senses the slightest vibration or movement. It will mount on any platform and the solid aluminum design will give peak performance and years of service.

SIG SOR52001 ROME05 1X20 M1913 2MOA .
Mfg Item Num: SOR52001
Model Number: Romeo5
Series: Compact
Unit of measure: EA
Magnification: 1x
Objective: 20mm
Field of View: Varies w/Eye Relief
Eye Relief: Unlimited
Dot Size: 2 MOA
Tube Diameter: 20mm
Length: 2.47
Weight: 5.10 oz
Finish: Black
Reticle: Red Dot
Adjustment Size: .5 MOA
Proofs: Waterproof Fogproof
Optic Coating: Spectracoat
Windage Elevation: Adjustable