The Sig Romeo 5 has been optimized for todays MSR/AR platforms. It provides a crisp sight picture with zero distortion with a 2 MOA red dot with 8 daylight and 2 night vision settings, unlimited eye relief and parallax free point of aim for rapid target engagement. The side loading CR2032 battery will provide 40,000+ hours of continuous run time and the MOTAC feature will turn the Romeo 5 on when it detects motion and off when it doesn't. The housing is made from durable and lightweight aircraft grade CNC aluminum and it is waterproof up to 1 meter. Lastly the Romeo 5 comes with the Sig Infinite Guarantee. Sig Sauer ROMEO5 Compact Red Dot Sight 1X20MM, 2 MOA Dot, 1/2 MOA Adjustments, M1913 Rail Mount BLACK SOR52001