The LM-MRDS (LaserMax-Micro Red Dot Sight) is a ultracompact sight for mourning on RMSc optics ready pistols. The housing is constructed of aircraft grade 7071 aluminum. The sight is ideal for conceal carry style pistols. The LM-MRDS comes equipped with an industry first external 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: 4 MOA Red Dot Winadage/Elevation Adjustment: 1 click = 1 MOA Operation Modes: Auto brightness or manual adjust RMSC mounting footprint Power Source: CR2032 included