The SIG SAUER ROMEO-X Enclosed is a sealed-emitter pistol red dot built for duty and everyday carry. The fully enclosed emitter keeps lint, dust, rain, and snow out of the optical path so your dot stays clear when it matters. Key Features Circle-dot reticle - 2 MOA center dot inside a 32 MOA ring for both speed and precision Fully enclosed, sealed 7075 aluminum emitter for maximum reliability in adverse conditions MOTAC (Motion Activated Illumination) wakes the dot on movement and sleeps it at rest - up to 20,000 hours of runtime Side-loading CR1632 battery tray - swap the battery without removing the optic or losing zero 15 daylight-bright illumination settings with a distortion-free aspherical lens Low deck height supports iron-sight co-witness; waterproof and shock-resistant Fitment ROMEO-X Pro footprint - the Leupold DeltaPoint Pro (DPP) pattern used by full-size optics-ready pistols such as the SIG P320 / M17 and any DeltaPoint Pro-cut slide (direct or via adapter plate).