You mean this?
http://www.staroptics.com.au/catalog...roducts_id=641
http://www.australiatelescopes.com.a...ct-finder.html
It is made by Saxon, my understanding is that you apply it to your scope, lookup the object in the star atlas, punch in the co-ordinates and it lights up some LEDs on the rings. You then push the scope until it aligns with the lights and the object should be in your finder.
But I could be wrong....