Sig's Romeo4S (Solar) Compact Red dot is designed for modern semi-auto pistols, MSR platforms and shotguns. Features 2 MOA Red Dot Ballistic Circle Dot. 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.