The ROMEO1PRO brings a new level of durability and performance to the miniature open-reflex red dot sight. Its aircraft-grade aluminum housing ensures corrosion resistance under the harshest environments, and a new upgraded point-source emitter provides increased brightness in day or night conditions with 12 brightness settings. The molded glass aspheric lens has upgraded high-performance coatings for superior light transmittance and zero distortion giving you fast, responsive target acquisition and accuracy. The ROMEO1PRO includes a ruggedized protective shroud in the box for extreme durability. Dependable waterproof (IPX-7 rated for complete water immersion up to 1 meter) and fogproof performance. Compatible with M17/M18/P320-M17/P320 XFive Legion/P320 XCompact/P320XFull/All PRO-CUT Slides/P320 Pro Series.