Red 8 MOA Dot  Utilizing Our Trademarked STIG-RS™ System For the RMR/407C/507C Footprints Shake Awake/Motion Deactivated Standby Up to 50,000 Hours of battery life IPX7 waterproof Top Mounted Battery Window Size - 26.5x22.5mm or 1.04"x0.89" Parallax Free 8 Daytime Settings/2 Night vision Settings   The Chameleon SRS8 is a red dot designed for competition and self-defense. It utilizes a high-visibility, blazing-fast 8MOA reticle.  Purpose-built for concealed carry, the width of the optics has been optimized to have the smallest profile possible as well as maximize ergonomics for handling your pistol slide. The STIG-RS(Astigmatism Relief System) reticle system is made for users with astigmatism, and feedback is clear; many see the benefits of using our STIG-RS LED emitters. Additionally, a larger 8MOA circle allows for lower brightness settings without harming reticle acquisition time, passively assisting. Window - 26.5x22.5mm or 1.04"x0.89"