The "SitePro" crosshair illuminator, from Smith's Abrasives Inc., is the absolute worst hunting accessory I've ever purchased...PERIOD!
It's a device that mounts to the ocular bell of your rifle scope, and is supposed to illuminate your reticle for low light shooting. It just flat out didn't work!
In addition to not working, It proved to be quite cumbersome and totally screws up your scope's eye relief, causing you to get whacked in the eyebrow during recoil. It seemed like an inexpensive way to get an "illuminated reticle" on a conventional scope, but I guess you really do get what you pay for. Paid about $20.00 for it ...$20.00 WASTED.
Here's a picture if you're not familiar with this device:
http://smithabrasives.com/sa/ I understand that this product is no longer being manufactured...and for good reason! Don't be duped into buying one that may be leftover in a sports shop somewhere. If you need an illuminated reticle, you'd be much better off spending the money on a real illuminated scope like a Bushnell Firefly or Burris Electro-dot.