The LM-CRDS (LaserMax-Compact Red Dot Sight) is a robust sight for mourning on RMR optics ready pistols. The housing is constructed of aircraft grade 7071 aluminum. The LM=CRDS comes equipped with an industry first external forward-facing light sensor which automatically adjust the brightness of the red dot based on ambient lighting conditions. A picatinny mount mounting hardware and battery are included.Features: External Light Sensor for Auto Brightness Management 10000 hour run time Brightness settings: 8 Day / 2 Night Shake to awake Reticle: 3 MOA Red Dot Winadage/Elevation Adjustment: 1 click = 1 MOA Operation Modes: Auto brightness or manual adjust RMR mounting footprint Power Source: CR1632 included