Vortex Defender-XL 1x Micro Red Dot - 5 MOA Dot - Other red dots are made for competition. The Defender-XL is built to win. Target to target. Stage to stage. Designed for toughness, speed, and accuracy, it withstands unexpected drops and the rigors of dynamic shooting. The ultra-wide sight window enhances field of view for quicker target acquisition, faster follow-up shots, and greater flexibility in unconventional shooting positions-all positioning you to dominate every round. Features Window Size: 25.5mm x 23.3mm; Large Distortion Free Sight Picture; Automatically activates with motion while 10 minute auto-shutoff saves battery life; ShockShield: Polymer insert absorbs shock to the 7075 aluminum body protecting it for everyday abuse; Fast-Rack Texturing: Aggressive texturing on face of optic for racking slide off any surface; Easy battery change without having to rezero your optic; 10 Daylight Bright Brightness Settings; Parallax Free: All red dot and holographic sights will exhibit some small amount of parallax. Matching current industry practice, this small amount would be considered "parallax free" and will make a negligible difference in performance.; Unlimited Eye Relief: Non-critical eye relief for rapid target acquisition; The lowest 2 settings are night-vision compatible.; Waterproof: O-ring seals prevent moisture, dust and debris from penetrating for reliable performance in all environments.; Designed to withstand a wide range of temperatures.; Corrosion and wear resistant anodization provides low-glare matte surface and helps camouflage the shooter's position.; Single-Piece Chassis: Compact and lightweight.;