Sig's Romeo4S (Solar) Compact Red dot is designed for modern semi-auto pistols, MSR platforms and shotguns. Features 2 MOA Red Ballistic Dot with a 65 MOA Circle. The Romeo4S is powered by solar panel collection coupled with the CR 2032 battery. Best for short and medium range engagements and recreational shooting across a wide range of calibers and light conditions. Features MOTAC (Motion Activated Illumination System), unlimited eye-relief and red LED illumination for daylight visibility and extended runtime. Includes solid and see-thru lens covers and co-witness QR mount and low mount included. IPX-7 waterproof.