<p>The HOLOSUN® HS507C-X2 Open Reflex Optical Sight features Solar Failsafe™ technology, and Shake Awake™ capability for ultrareliable function and performance. Solar Failsafe allows the sight to remain powered when your battery fails. Holosun optics with Solar Failsafe feature automatic brightness adjustment; when you're under the sun you have a bright reticle, when you move indoors it will automatically dim down to match ambient lighting conditions for maximum versatility. This reflex sight features multilayer reflective glass for a parallax-free field of view, with minimal light saturation for crystal clear sight acquisition. Offers up to 50,000 hours of battery life, 12 Super LED brightness settings, and 3 selectable reticles. Operates on 1 CR1632 battery (included).</p> <ul> <li>Aircraft aluminum construction</li> <li>Solar Failsafe technology for backup power</li> <li>Shake Awake technology for effortless activation</li> <li>Multilayer reflective glass</li> <li>12 brightness settings</li> <li>Up to 50,000 hours of battery life</li> <li>3 selectable reticles</li> </ul>