If you already own The Perfect Survival Flashlight, you can upgrade it to the Special Edition with this simple to install kit.

Special Edition Upgrade Kit contains:

• Low-iron, water white float glass lens with multi-layered, broadband, anti-reflective (AR) coating applied to both sides.  This upgraded lens accounts for additional strength, scratch resistance and 98%-99% light transmittance, potentially a 20% increase in output over the stock plastic lens. Yes, the difference is quite noticeable.
  
• Improved, glow-in-the-dark, silicon o-rings which will seal better and last longer (and they look cooler). 
• Installation instructions
  

Within just a few minutes and no special tools, you can transform a great flashlight into one that is even greater!