Primary Arms GLx MD-21S Micro Reflex Red Dot Sight 1x ACSS-CQB Red Dot Reticle Black. This red dot features an advanced solar failsafe system supplementing your power supply to ensure the optic operates with maximum runtime. In addition this optic features fully upgraded lenses a new ultra-bright emitter intuitive push-button controls and our heavy-duty mount system. Specifications for Primary Arms GLx MD-21S 1x Micro Reflex Red Dot Sight: Manufacturer: Primary Arms Color: Black Magnification: 1 x Illumination Color: Red Battery Type: Lithium Metal CR2032 Red Dot Sights-Footprint: Not Applicable Features of Primary Arms GLx MD-21S 1x Micro Reflex Red Dot Sight Autolive Multi-coated Lens Multi-reticle select Push-button controls Red dot bright Shockproof Solar backup Waterproof Package Contents: Primary Arms GLx MD-21S 1x Micro Reflex Red Dot Sight Primary Arms 810026: GLx MD-21S Micro Reflex Red Dot Sight 1x ACSS-CQB Red Dot Reticle Black