The RAD MAX (Rapid Aiming Dot) and MAX Pro Electronic Sights are compact Open Reflex Sight for rifles and shotguns. Featuring a 3.25 MOA round aiming dot and a wide field of view (FOV) the RAD MAX will elevate your long gun's performance instantly. Easily user-installed they includes a low-profile snag-free M1913 Picatinny mount. - Top accessible battery compartment - Battery life: 40000 hours (4.5 Years) - Shock impact fog and vibration resistant design - Low-profile snag-free design - High efficiency LED for years of maintenance-free use - Large function buttons for brightness setting - Sleep function for auto shut-off - Ambient light sensor - Shake to Wake Sensor - Included low M1913 Picatinny mount - Included high M1913 Picatinny riser