The Defender-ST Micro Red Dot Sight is engineered specifically for everyday and concealed carry, exemplifying the performance and quality synonymous with Vortex optics. It features a large aspherical window, one of the biggest in its category, providing a clear, distortion-free sight picture. The Defender-ST is designed for exceptional durability, equipped with the exclusive ShockShield polymer insert to withstand everyday shocks, impacts, vibrations, and repeated recoil effortlessly. The innovative FastRack feature adds to its robustness, with a knurled texture machined into the optic's face, allowing it to rack the slide of the host pistol against any surface. Additionally, the Defender-ST includes motion activation for instant readiness and an automatic shut-off to conserve battery life.Footprint DeltaPoint ProWaterproof O-ring seals prevent moisture, dust and debris from penetrating for reliable performance in all environments.Fogproof Designed to withstand a wide range of temperatures.Shockproof Rugged construction withstands recoil and impact.Unlimited Eye Relief Non-critical eye relief for rapid target acquisition.