Tactical Red Dot Sight (batteries included): This red dot puts other high-priced red dot sights to shame. It has two brightness settings and an extremely wide viewing area. The impact resistant body can take abuse and will come back for more. It mounts seamlessly to any Weaver or Picatinny rail as well as all of the Tippmann A-5's (using our own proprietary mounting technology). This red dot allows you to put a red X on your target (in the viewing area inside the red dot, it's not an actual projection beam) while keeping both eyes open. You can adjust it for accuracy (up/down and left/right) for the most precise shot possible. Not to mention, this red dot sight comes with one battery installed and includes an extra one as well!