Red 3 MOA Dot For the RMR/407C/507C Footprints Shake Awake/Motion Deactivated Standby Up to 50,000 Hours of battery life IPX7 waterproof Side Mounted Battery Window Size - 24x17mm or 0.94"x0.67" Parallax Free 8 Daytime Settings/2 Night vision Settings The Cyelee WOLF PRO red dot sight is designed for duty use. It has a sturdy body while not appearing bulky, and offers rugged reliability, for everyday use and carry, in any environment. Protecting yourself, your home, and those around you requires 24/7 reliability, instant target acquisition, intuitive control, and innovative electronics that you can trust to function properly every time. The WOLF PRO red dot sight promises to withstand continuous use and recoil from the hardest-hitting handguns and is compatible with most common IWB/OWB handgun holsters. The WOLF PRO sight uses an RMR footprint that can be installed immediately on the most popular optic-ready pistols. The WOLF PRO red dot is also equipped with advanced Motion Deactivated Standby technology to ensure it is always ready to go! Window - 24x17mm or 0.94"x0.67"