Vortex SPARC® AR Red Dot
Simple—Fast—Effective—Point and Shoot. When you boil it down, these are the advantages of a red dot sight. And that’s what the SPARC® AR delivers, all in a durable, lightweight, compact, and rubber armor-clad package.Digital rear-facing power and dot brightness controls in the base offer quick access and are viewable from the shooting position. The 2 MOA dot diameter promotes precise point of aim and it automatically returns to the last dot intensity when powered up.
http://www.vortexoptics.com/category/sparc_ar_red_dotVortex SPARC® AR Red Dot