The romeo2 is built for use in adverse conditions.A 3 moa red dot with 15 brightness settings ensures rapid target engagement.The romeo2 mil-spec reflex sight features a high-efficiency point source led emitter and molded aspheric glass lens utilizing a high-performance red notch reflector coating for excellent brightness and light transmittance with zero distortion.The 7075 aluminum housing and ruggedized steel shrouds protect the romeo2 from extreme impacts and drops.The romeo2 maintains 25 000 hours of battery life comes with motac to automatically power the optic on and off and is compatible with all sig pistols that have the newer pro-cut slide.Full shroud only* ipx7 waterproof.Battery Size: CR2032Magnification: 1xObjective: 30 mmDot Size: 3 MOALength: 1.84"Weight: 1.58 oz (Without Shroud)/2.50 oz (With Shroud)Reticle: 3 MOA Red DotAdjustment Size: 1 MOAProofs: WaterproofOptic Coating: D.A.R.C. (Dark Adaptive Reticles & Coatings)Windage Elevation: Adjustable