CT RADIANT(TM) ambient light sensor - The ambient light sensor automatically adjusts the aiming dot's brightness to the surrounding lighting condition. CT micro(TM) Mounting Pattern - Fits most compact handguns and is compatible with Shield RMSA(R) and JPointA(R) footprints. Integrated rear sight cut into the base of the CT RAD(TM) micro for use with front iron sight - Recessed optic lens for increased durability. Adjustable windage and elevation - aerospace aluminum construction - IPX4 water resistant - Rubber sight cover included. (1) CR1632 battery included - 20,000 hours of runtime (Red)/7,000 hours of runtime (Green) - 3 MOA dot (Red)/5 MOA dot (Green). Mfg: Crimson Trace Corporation