Holosun ARO Advanced Rifle Optic 1x22mm Reflex Red Dot Sight Red 2MOA Dot Reticle w/ HM3X Magnifier Black ARO-RD2 & HM3X. ARO features an all-new 22mm housing design that mates perfectly with our magnifier series an all-new 1.63 lower 1/3 co-witness pedestal mount and compatibility with a new lens cover and anti-reflection device system (available separately). This combo package features the ARO-RD2 and HM3X in a hard case. Specifications for Holosun ARO Advanced Rifle Optic 1x22mm Reflex Red Dot Sight w/HM3X Magnifier: Manufacturer: Holosun Color: Black Fabric/Material: Aluminum Magnification: 1 x Objective Lens Diameter: 22 mm Reticle: 2 MOA Dot Illumination Type: LED Illumination Color: Red Brightness Settings: 12 Eye Relief: Unlimited Adjustment Click Value: 0.5 MOA Battery Type: Lithium Metal CR2032 Battery Life: 50000 hours Water Resistance Level: IP67 Red Dot Sights-Footprint: Not Applicable Package Contents: Holosun ARO Advanced Rifle Optic 1x22mm Reflex Red Dot Sight w/HM3X Magnifier Holosun ARO-RD2 & HM3X: ARO Advanced Rifle Optic 1x22mm Reflex Red Dot Sight Red 2MOA Dot Reticle w/ HM3X Magnifier Black