Sig Sauer ROMEO-RS Open Reflex Red Dot (PRO Footprint)
The Sig Sauer ROMEO-RS is an open reflex pistol optic built around a reinforced hybrid design with a skeletonized steel chassis molded into a high-strength polymer housing. It features an aspheric glass lens for a low-distortion sight picture, along with SIG SAUER MOTAC (motion-activated illumination) and a side-mounted battery tray to allow battery changes without removing the optic.
This optic uses a CR1632 battery and provides 8 brightness settings with a stated continuous runtime of 20,000 hours at medium brightness (dot only).