AEMS PRO X2 enhances the AEMS platform by improving accuracy through an advanced optical system that reduces parallax by 50%. AEMS X2 PRO also introduces a forward-facing light sensor creating a smarter AUTO Mode that improves dot contrast in dynamic lighting conditions while in AUTO Mode. AEMS X2 PRO also includes a new anti-reflective device and an all-new four post, lower 1/3 co-witness mount. AEMS X2 PRO remains backwards compatible with original AEMS mounts. Specifications for Holosun AEMS PRO X2 1x 1.1x0.87in Holographic Red Dot Sight: Manufacturer: Holosun Color: Black Fabric/Material: 7075-T6 Aluminum Magnification: 1 x Objective Window Size: 1.1x0.87 in Reticle: 2 MOA Dot 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 Weight: 10.4 oz Package Contents: Holosun AEMS PRO X2 1x 1.1x0.87in Holographic Red Dot Sight