The RAD (Rapid Aiming Dot) and RAD Pro Electronic Sights are compact Open Reflex Sights for full size pistols. Featuring a 3 MOA round aiming dot the RAD will elevate your pistol's performance instantly. Easily user-installed by utilizing an industry standard mounting interface they boast a high efficiency LED for years of use. - Top accessible battery compartment - Battery life: 40000 hours (4.5 Years) - Industry standard Docter mounting interface - 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 settings - Sleep function for auto shut-off