The Athlon TSP1 prism scope gives you great versatility. This device is equipped with a prism for a crisp, vivid image. The prism-based design allows for a more compact scope without sacrificing optical quality. The Midas TSP1 features the ability to toggle between both Red and Green illumination. Forget to turn it on? Batteries run dead? No worries, this etched reticle is visible even without a battery installed. The Athlon prism red dots are nitrogen-filled, fog proof and shock proof, allowing for reliable use in a wide range of environments. The reticles are etched directly on the glass to make sure you have consistent point-of-aim at all times. Whether you have the illumination on or off, the reticle is always visible.