Crimson Trace Corporation, RAD Micro, Green Dot, Compact Open Reflex Sight, Black, 5 MOA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. Battery Life: 7,000 Hours Bottom Accessible Battery Compartment Rear Sight Notch Cut Into Sight Product Description The CT RAD Micro (Rapid Aiming Dot) Electronic Sight is an ultra-compact Open Reflex Sight for compact and subcompact pistols. Featuring a red 5 MOA aiming dot, the CT RAD Micro has a recessed and fully multi-coated lens with a large quick acquisition window. The CT RAD Micro comes with the CT RADIANT Ambient Light Sensor that automatically adjusts the aiming dot's brightness to the surrounding lighting condition. The Micro is easily installed on an optics cut slide using the CT micro footprint that is also compatible with the Shield RMS and JPoint footprints. The Micro has a rear sight notch cut into the back to line up with your front iron sight. Made of 7075 Series Aerospace Aluminum, it is 30% stronger than most industry standard sights made with 6061 Series Aluminum. The entire CT RAD family has an Innovative top strap design that deflects force if the sight is dropped.