Experience with Lightning tack touch welder

Hello,

Has anyone worked with or have knowledge about the “Lightning Tack -
Touch Welder”? The front looks just like the Tack III welder.

I did a Google search but could not find anything. I am searching
for a manual for it.

What is the difference between the “Tack III” and the “Lightning
Tack - Touch Welder”.

I bought it used but now wonder if I should not have gone for the
Tack III.

Regards.
Johan