*Have added confidence in your shot with the integrated co-witness sight*20,000 hours (2 years) of battery life that runs on (1) CR2032 battery (included)*Sight features a bright 3.5 MOA red dot reticle for easy target acquisitionIncrease your confidence with this Crimson Trace CTS-1550 Ultra Compact Open Reflex Sight for compact and subcompact pistols. The 3.5 MOA LED aiming dot has a battery life of 20,000 hours and an ambient light sensor to automatically adapt brightness. Adjustable windage and elevation allows you to customize the sight to fit your needs. The industry standard mounting interface makes the CTS-1550 easy to install and has an integrated co-witness sight to give you added certainty when taking aim.