LaserMax Enclosed Reflex Red Dot Sight 3 MOA Red Dot Reticle Matte Black. the housing is constructed of aircraft grade 7071 aluminum. The LM=ERDS 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 RMR and Glock MOS mounting base plates are included. Specifications for LaserMax Enclosed Reflex Red Dot Sight: Manufacturer: LaserMax Color: Matte Black Fabric/Material: Aluminum Magnification: 1 x Objective Window Size: 20.6x18 mm Reticle: 3 MOA Red Dot Illumination Type: LED Illumination Color: Red Eye Relief: Unlimited Adjustment Click Value: 1 MOA Emitter Type: Enclosed Battery Type: Lithium Metal CR2032 Battery Life: 50000 hours Red Dot Sights-Footprint: RMR Lens Type: Glass Adjustability: Adjustable Features of LaserMax Enclosed Reflex Red Dot Sight : External Forward-Facing Light Sensor for Auto Brightness Management 50000 hour run time on mid setting 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 and Glock MOS base plates included Power Source: CR2032 included Package Contents: LaserMax Enclosed Reflex Red Dot Sight