The Mepro M22 PRO features a factory-installed light module that eliminates reticle washout and enhances low-light performance. With cutting-edge fiber-optic illumination for daylight visibility and tritium vials for nighttime clarity. Meprolight engineers designed a battery powered mechanism to enhance the reticle in extremely lowlight. The single CR2032 battery provides over 50,000 hours of use. The auto-adjuster reacts to ambient light to maintain a crisp reticle in the worst conditions. The transition between fiber-optic and tritium systems is instantaneous and automatic. Its reliable in all weather conditions and compatible with night vision devices (NVDs) and magnifiers for added versatility.